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From Wikipedia, the free encyclopedia

An SMS being received
E.161, the most common mobile keypad alphabet layout

Short Message Service (SMS) is a communication service component of the GSM mobile communication system, using standardized communications protocols that allow the exchange of short text messages between mobile phone devices. SMS text messaging is the most widely used data application in the world, with 2.4 billion active users, or 74% of all mobile phone subscribers.[citation needed] The term SMS is used as a synonym for all types of short text messaging, as well as the user activity itself, in many parts of the world.

SMS as used on modern handsets was originally defined as part of the Global System for Mobile Communications (GSM) series of standards in 1985[1] as a means of sending messages of up to 160 characters[2], to and from GSM mobile handsets.[3] Since then, support for the service has expanded to include other mobile technologies such as ANSI CDMA networks and Digital AMPS, as well as satellite and landline networks.[citation needed] Most SMS messages are mobile-to-mobile text messages, though the standard supports other types of broadcast messaging as well.



Initial concept

SMS messages sent monthly in USA (billion)

The idea of adding text messaging to the services of mobile users was latent in many communities of mobile communication services at the beginning of the 1980s. The first action plan of the CEPT Group GSM, approved in December 1982, requested "The services and facilities offered in the public switched telephone networks and public data networks... should be available in the mobile system".[4] This target includes the exchange of text messages either directly between mobile stations, or transmitted via Message Handling Systems widely in use since the beginning of the 1980s.[5]

The SMS concept was developed in the Franco-German GSM cooperation in 1984 by Friedhelm Hillebrand and Bernard Ghillebaert.[6] The innovation in SMS is Short. The GSM system is optimized for telephony, since this was identified as its main application. The key idea for SMS was to use this telephony-optimized system, and to transport messages on the signaling paths needed to control the telephony traffic during time periods when no signaling traffic existed. In this way, unused resources in the system could be used to transport messages at minimal cost. However, it was necessary to limit the length of the messages to 128 bytes (later improved to 140 bytes, or 160 7-bit characters), so that the messages could fit into the existing signaling formats.

This concept allowed SMS to be implemented in every mobile station, by updating its software. This concept was instrumental for the implementation of SMS in every mobile station ever produced and in every network from early days. Hence, a large base of SMS capable terminals and networks existed when the users began to utilize the SMS.[7] A new network element required was a specialized Short Message Service Center, and enhancements were required to the radio capacity and network transport infrastructure to accommodate growing SMS traffic.

Early development

The technical development of SMS was a multinational collaboration supporting the framework of standards bodies, and through these organizations the technology was made freely available to the whole world. This is described and supported by evidence in the following sections.[8]

The first proposal which initiated the development of SMS was made by a contribution of Germany and France into the GSM group meeting in February 1985 in Oslo[9]. This proposal was further elaborated in GSM subgroup WP1 Services (Chairman Martine Alvernhe, France Telecom) based on a contribution from Germany. There were also initial discussions in the subgroup WP3 network aspects chaired by Jan Audestad (Telenor). The result was approved by the main GSM group in a June '85 document which was distributed to industry.[10] The input documents on SMS had been prepared by Friedhelm Hillebrand (Deutsche Telekom) with contributions from Bernard Ghillebaert (France Télécom).

SMS was considered in the main GSM group as a possible service for the new digital cellular system. In GSM document "Services and Facilities to be provided in the GSM System",[1] both mobile-originated and mobile-terminated short messages appear on the table of GSM teleservices.

The discussions on the GSM services were concluded in the recommendation GSM 02.03 "TeleServices supported by a GSM PLMN".[11] Here a rudimentary description of the three services was given:

  1. Short message Mobile Terminated (SMS-MT)/ Point-to-Point: the ability of a network to transmit a Short Message to a mobile phone. The message can be sent by phone or by a software application.
  2. Short message Mobile Originated (SMS-MO)/ Point-to-Point: the ability of a network to transmit a Short Message sent by a mobile phone. The message can be sent to a phone or to a software application.
  3. Short message Cell Broadcast.

The material elaborated in GSM and its WP1 subgroup was handed over in Spring 1987 to a new GSM body called IDEG (the Implementation of Data and Telematic Services Experts Group), which had its kickoff in May 1987 under the chairmanship of Friedhelm Hillebrand (German Telecom). The technical standard known today was largely created by IDEG (later WP4) as the two recommendations GSM 03.40 (the two point-to-point services merged together) and GSM 03.41 (cell broadcast).

WP4 created a Drafting Group Message Handling (DGMH), which was responsible for the specification of SMS. It was chaired by Finn Trosby (Telenor). DGMH had about five to eight participants (Finn Trosby mentions as a contributor Alan Cox of Vodafone). The first action plan[12] mentions for the first time the Technical Specification 03.40 “Technical realisation of the Short Message Service”. Responsible editor was Finn Trosby. The first draft of the technical specification was completed in November 1987 [13] A comprehensive description [14].

The work on the draft specification continued in the following few years, where Kevin Holley of Cellnet (now Telefonica O2 UK) played a leading role. Besides the completion of the main specification GSM 03.40, the detailed protocol specifications on the system interfaces also needed to be completed.

Support in other architectures

The Mobile Application Part (MAP) of the SS7 protocol included support for the transport of Short Messages through the Core Network from its inception.[15] MAP Phase 2 expanded support for SMS by introducing a separate operation code for Mobile Terminated Short Message transport.[16] Since Phase 2, there have been no changes to the Short Message operation packages in MAP, although other operation packages have been enhanced to support CAMEL SMS control.

From 3GPP Releases 99 and 4 onwards, CAMEL Phase 3 introduced the ability for the Intelligent Network (IN) to control aspects of the Mobile Originated Short Message Service,[17] while CAMEL Phase 4, as part of 3GPP Release 5 and onwards, provides the IN with the ability to control the Mobile Terminated service.[18] CAMEL allows the gsmSCP to block the submission (MO) or delivery (MT) of Short Messages, route messages to destinations other than that specified by the user, and perform real-time billing for the use of the service. Prior to standardized CAMEL control of the Short Message Service, IN control relied on switch vendor specific extensions to the Intelligent Network Application Part (INAP) of SS7.

Early implementations

The first SMS message[19] was sent over the Vodafone GSM network in the United Kingdom on 3 December 1992, from Neil Papworth of Sema Group (now Airwide Solutions) using a personal computer to Richard Jarvis of Vodafone using an Orbitel 901 handset. The text of the message was "Merry Christmas".[20] The first SMS typed on a GSM phone was sent by Riku Pihkonen, an engineering student at Nokia, in 1993.[21]

The first commercial deployment of a Short Message Service Center (SMSC) was by Aldiscon (now Acision) with TeliaSonera in Sweden in 1993[22], followed by Fleet Call (now Nextel)[citation needed] in the US, Telenor in Norway[citation needed] and BT Cellnet (now O2 UK)[citation needed] later in 1993. All first installations of SMS gateways were for network notifications sent to mobile phones, usually to inform of voice mail messages. The first commercially sold SMS service was offered to consumers, as a person-to-person text messaging service by Radiolinja (now part of Elisa) in 1993. It should be noted that most early GSM mobile phone handsets did not support the ability to send SMS text messages, and Nokia was the only handset manufacturer whose total GSM phone line in 1993 supported user-sending of SMS text messages.

Initial growth was slow, with customers in 1995 sending on average only 0.4 messages per GSM customer per month.[23] One factor in the slow takeup of SMS was that operators were slow to set up charging systems, especially for prepaid subscribers, and eliminate billing fraud which was possible by changing SMSC settings on individual handsets to use the SMSCs of other operators[citation needed].

Over time, this issue was eliminated by switch-billing instead of billing at the SMSC and by new features within SMSCs to allow blocking of foreign mobile users sending messages through it. By the end of 2000, the average number of messages reached 35 per user per month,[23] and by Christmas Day 2006, over 205 million messages were sent in the UK alone.[24]

It is also alleged that the fact that roaming customers, in the early days, rarely received bills for their SMSs after holidays abroad had a boost on text messaging as an alternative to voice calls.[citation needed]

Text messaging outside GSM

SMS was originally designed as part of GSM, but is now available on a wide range of networks, including 3G networks. However, not all text messaging systems use SMS, and some notable alternative implementations of the concept include J-Phone's SkyMail and NTT Docomo's Short Mail, both in Japan. Email messaging from phones, as popularized by NTT Docomo's i-mode and the RIM BlackBerry, also typically uses standard mail protocols such as SMTP over TCP/IP.

SMS today

In 2008, 4.1 trillion SMS text messages were sent. SMS has become a massive commercial industry, worth over 81 billion dollars globally as of 2006.[25] The global average price for an SMS message is 0.11 USD, while the cost to providers approaches zero. Mobile networks charge each other so-called interconnect fees of at least £0.03 when connecting between different phone networks.[26]

Technical details


The Short Message Service - Point to Point (SMS-PP) is defined in GSM recommendation 03.40.[3] GSM 03.41 defines the Short Message Service - Cell Broadcast (SMS-CB), which allows messages (advertising, public information, etc.) to be broadcast to all mobile users in a specified geographical area.[27] Messages are sent to a Short Message Service Center (SMSC) which provides a "store and forward" mechanism. It attempts to send messages to the SMSC's recipients. If a recipient is not reachable, the SMSC queues the message for later retry.[28] Some SMSCs also provide a "forward and forget" option where transmission is tried only once. Both Mobile Terminated (MT, for messages sent to a mobile handset) and Mobile Originating (MO, for those sent from the mobile handset) operations are supported. Message delivery is "best effort", so there are no guarantees that a message will actually be delivered to its recipient, and delay but complete loss of a message is uncommon. Users may request delivery reports to confirm that messages reach the intended recipients, either via the SMS settings of most modern phones, or by prefixing each message with *0# or *N#.

Message size

Transmission of short messages between the SMSC and the handset is done whenever using the Mobile Application Part (MAP) of the SS7 protocol. Messages are sent with the MAP mo- and mt-ForwardSM operations, whose payload length is limited by the constraints of the signaling protocol to precisely 140 octets (140 octets = 140 * 8 bits = 1120 bits). Short messages can be encoded using a variety of alphabets: the default GSM 7-bit alphabet, the 8-bit data alphabet, and the 16-bit UTF-16 alphabet.[29] Depending on which alphabet the subscriber has configured in the handset, this leads to the maximum individual Short Message sizes of 160 7-bit characters, 140 8-bit characters, or 70 16-bit characters (including spaces). GSM 7-bit alphabet support is mandatory for GSM handsets and network elements,[29] but characters in languages such as Arabic, Chinese, Korean, Japanese or Cyrillic alphabet languages (e.g. Russian, Serbian, Bulgarian, etc) must be encoded using the 16-bit UTF-16 character encoding (see Unicode). Routing data and other metadata is additional to the payload size.

Larger content (Concatenated SMS, multipart or segmented SMS, or "Long SMS") can be sent using multiple messages, in which case each message will start with a user data header (UDH) containing segmentation information. Since UDH is part of the payload, the number of available characters per segment is lower: 153 for 7-bit encoding, 133 for 8-bit encoding and 67 for 16-bit encoding. The receiving handset is then responsible for reassembling the message and presenting it to the user as one long message. While the standard theoretically permits up to 255 segments,[30] 6 to 8 segment messages are the practical maximum, and long messages are often billed as equivalent to multiple SMS messages. See Concatenated SMS for more information. Some providers have offered length-oriented pricing schemes for SMSs, however, the phenomenon is disappearing.

SMS Gateway providers

SMS gateway providers facilitate SMS traffic between businesses and mobile subscribers, including mission-critical messages, SMS for enterprises, content delivery, and entertainment services involving SMS, e.g. TV voting. Considering SMS messaging performance and cost, as well as the level of messaging services, SMS gateway providers can be classified as aggregators or SS7 providers.

The aggregator model is based on multiple agreements with mobile carriers to exchange 2-way SMS traffic into and out of the operator’s SMSC, also known as local termination model. Aggregators lack direct access into the SS7 protocol, which is the protocol where the SMS messages are exchanged. SMS messages are delivered to the operator’s SMSC, but not the subscriber’s handset; the SMSC takes care of further handling of the message through the SS7 network.

Another type of SMS gateway provider is based on SS7 connectivity to route SMS messages, also known as international termination model. The advantage of this model is the ability to route data directly through SS7, which gives the provider total control and visibility of the complete path during SMS routing. This means SMS messages can be sent directly to and from recipients without having to go through the SMSCs of other mobile operators. Therefore, it’s possible to avoid delays and message losses, offering full delivery guarantees of messages and optimized routing. This model is particularly efficient when used in mission-critical messaging and SMS used in corporate communications.

Interconnectivity with other networks

Message Service Centers communicate with the Public Land Mobile Network (PLMN) or PSTN via Interworking and Gateway MSCs.

Subscriber-originated messages are transported from a handset to a Service Center, and may be destined for mobile users, subscribers on a fixed network, or Value-Added Service Providers (VASPs), also known as application-terminated. Subscriber-terminated messages are transported from the Service Center to the destination handset, and may originate from mobile users, from fixed network subscribers, or from other sources such as VASPs.

On some carriers non-subscribers can send messages to a subscriber's phone using an Email-to-SMS gateway. Additionally, many carriers, including AT&T, T-Mobile[31], Sprint[32], and Verizon Wireless[33], offer the ability to do this through their respective websites. For example, an AT&T subscriber whose phone number was 555-555-5555 would receive e-mails to as text messages. Sending a message this way is free, but subject to the normal length limit.

Text-enabled fixed-line handsets are required to receive messages in text format. However, messages can be delivered to non-enabled phones using text-to-speech conversion.[34]

Short messages can send binary content such as ringtones or logos, as well as Over-the-air programming (OTA) or configuration data. Such uses are a vendor-specific extension of the GSM specification and there are multiple competing standards, although Nokia's Smart Messaging is common. An alternative way for sending such binary content is EMS messaging, which is standardized and not dependent on vendors.

SMS is used for M2M (Machine to Machine) communication. For instance, there is an LED display machine controlled by SMS, and some vehicle tracking companies use SMS for their data transport or telemetry needs. SMS usage for these purposes is slowly being superseded by GPRS services due to their lower overall cost[citation needed]. GPRS is offered by smaller telco players as a route of sending SMS text to reduce the cost of SMS texting internationally.[35]

AT commands

Many mobile and satellite transceiver units support the sending and receiving of SMS using an extended version of the Hayes command set, a specific command language originally developed for the Hayes Smartmodem 300-baud modem in 1977.[citation needed]

The connection between the terminal equipment and the transceiver can be realized with a serial cable (i.e. USB), a Bluetooth link, an infrared link, etc. Common AT commands include AT+CMGS (send message), AT+CMSS (send message from storage), AT+CMGL (list messages) and AT+CMGR (read message).[36]

However, not all modern devices support receiving of messages if the message storage (for instance the device's internal memory) is not accessible using AT commands.

Premium-rated short messages

Short messages may be used to provide premium rate services to subscribers of a telephone network.

Mobile-terminated short messages can be used to deliver digital content such as news alerts, financial information, logos and ring tones. The first premium-rate media content delivered via the SMS system was the world's first paid downloadable ringing tones, as commercially launched by Saunalahti (later Jippii Group, now part of Elisa Group) in 1998. Initially in 1998, only Nokia branded phones could accept this type of external music installment. By 2002, the ring tone business globally had exceeded one billion dollars of service revenues and in 2008 the 'basic ringing tone' industry was worth nearly 5 billion dollars.

The Value-added service provider (VASP) providing the content submits the message to the mobile operator's SMSC(s) using a TCP/IP protocol such as the short message peer-to-peer protocol (SMPP) or the External Machine Interface (EMI). The SMSC delivers the text using the normal Mobile Terminated delivery procedure. The subscribers are charged extra for receiving this premium content, and the amount is typically divided between the mobile network operator and the VASP either through revenue share or a fixed transport fee.

Mobile-originated short messages may also be used in a premium-rated manner for services such as televoting. In this case, the VASP providing the service obtains a short code from the telephone network operator, and subscribers send texts to that number. The payouts to the carriers vary by carrier, and the percentages paid are greatest on the lowest-priced premium SMS services. Most information providers should expect to pay about 45% of the cost of the premium SMS up front to the carrier. The submission of the text to the SMSC is identical to a standard MO Short Message submission, but once the text is at the SMSC, the Service Center (SC) identifies the Short Code as a premium service. The SC will then direct the content of the text message to the VASP, typically using an IP protocol such as SMPP or EMI. Subscribers are charged a premium for the sending of such messages, with the revenue typically shared between the network operator and the VASP. Limitations of short codes include the limitation to national borders (short codes have to be activated in each country where the campaign takes place), as well as being expensive to sign up together with mobile operators.

An alternative to inbound SMS is based on long numbers (international number format, e.g. +44 7624 805000), which can be used in place of short codes for SMS reception in several applications, such as TV voting, product promotions and campaigns. Long numbers are internationally available, as well as enabling businesses to have their own numbers, rather than short codes which are usually shared across a lot of brands. Additionally, long numbers are non-premium inbound numbers.

SMS in satellite phone networks

All commercial satellite phone networks except ACeS and OptusSat support SMS[citation needed]. While early Iridium handsets only support incoming SMS, later models can also send messages. The price per message varies for different networks. Unlike some mobile phone networks, there is no extra charge for sending international SMS or to send one to a different satellite phone network. SMS can sometimes be sent from areas where the signal is too poor to make a voice call.

Satellite phone networks usually have web-based or email-based SMS portals where one can send free SMS to phones on that particular network.


The Global Service for Mobile communications (GSM), with the greatest worldwide number of users, succumbs to several security vulnerabilities. In the GSM, only the airway traffic between the Mobile Station (MS) and the Base Transceiver Station (BTS) is optionally encrypted with a weak and broken stream cipher (A5/1 or A5/2). The authentication is unilateral and also vulnerable. There are also many other security vulnerabilities and shortcomings[37]. Such vulnerabilities are inherent to SMS as one of the superior and well-tried services with a global availability in the GSM networks. SMS messaging has some extra security vulnerabilities due to its store-and-forward feature, and the problem of fake SMS that can be conducted via the Internet. When a user is roaming, SMS content passes through different networks, perhaps including the Internet, and is exposed to various vulnerabilities and attacks. Another concern arises when an adversary gets access to a phone and reads the previous unprotected messages [38].

In October 2005, researchers from Pennsylvania State University published an analysis of vulnerabilities in SMS-capable cellular networks.[39] The researchers speculated that attackers might exploit the open functionality of these networks to disrupt them or cause them to fail, possibly on a nationwide scale.

SMS spoofing

The GSM industry has identified a number of potential fraud attacks on mobile operators that can be delivered via abuse of SMS messaging services. The most serious of threats is SMS Spoofing. SMS Spoofing occurs when a fraudster manipulates address information in order to impersonate a user that has roamed onto a foreign network and is submitting messages to the home network. Frequently, these messages are addressed to destinations outside the home network – with the home SMSC essentially being “hijacked” to send messages into other networks.

The only 100% sure way of detecting and blocking spoofed messages is to screen incoming mobile-originated messages to verify that the sender is a valid subscriber and that the message is coming from a valid and correct location. This can be implemented by adding an intelligent routing function to the network that can query originating subscriber details from the HLR before the message is submitted for delivery. This kind of intelligent routing function is beyond the capabilities of legacy messaging infrastructure.[40]


See also


  1. ^ a b GSM Doc 28/85 "Services and Facilities to be provided in the GSM System" rev2, June 1985
  2. ^ LA Times: Why text messages are limited to 160 characters
  3. ^ a b GSM 03.40 Technical realization of the Short Message Service (SMS).
  4. ^ see GSM document 02/82 available in the ETSI archive
  5. ^ These Message Handling Systems had been standardized in the ITU, see specifications X.400 series
  6. ^ See the book Hillebrand, Trosby, Holley, Harris: SMS the creation of Personal Global Text Messaging, Wiley 2010
  7. ^ See GSM document 28/85rev.2 of June 85 and GSM WP1 document 66/86 available in the ETSI archive
  8. ^ See also Friedhelm Hillebrand "GSM and UMTS, the creation of Global Mobile Communication", Wiley 2002, chapters 10 and 16, ISBN 0470 84322 5
  9. ^ GSM document 19/85, available in the ETSI archive
  10. ^ GSM document 28/85r2, available in the ETSI archive
  11. ^ GSM TS 02.03, Teleservices Supported by a GSM Public Land Mobile Network (PLMN).
  12. ^ Document GSM IDEG 79/87r3, available in the ETSI archive
  13. ^ GSM 03.40, WP4 document 152/87, available in the ETSI archive
  14. ^ Finn Trosby, "the strange duckling of GSM SMS", Telektronikk Vol.3 2004.
  15. ^ MAP phase 1 specification, available from the 3GPP web site.
  16. ^ MAP phase 2 specification, available from the 3GPP web site.
  17. ^ CAMEL Phase 3 specification, available from the 3GPP web site.
  18. ^ CAMEL Phase 4 specification, also available from the 3GPP specification page.
  19. ^ Hppy bthdy txt! December 2002, BBC News.
  20. ^ UK hails 10th birthday of SMS, December 2002, The Times of India.
  21. ^ False dawn of the photo phone boom, Jan 2003, The Scotsman.
  22. ^ First commercial deployment of Text Messaging (SMS)
  23. ^ a b GSM World press release
  24. ^ Crystal, David (2008-07-05). "2b or not 2b?". Guardian Unlimited.,,2289259,00.html. Retrieved 2008-07-08. 
  25. ^ ITU Internet Report 2006:, Chapter 3
  26. ^
  27. ^ GSM 03.41, Technical Realization of Short Message Service Cell Broadcast (SMSCB).
  28. ^ Gil Held: "Data over Wireless Networks". page 105-111, 137-138. Wiley, 2001.
  29. ^ a b 3GPP TS 23.038, Alphabets and language-specific information.
  30. ^ Ian Groves: "Mobile Systems", page 70, 79, 163-166. Chapman & Hall, 1998.
  31. ^ "t-zones text messaging: send and receive messages with mobile text messaging". Retrieved 2008-09-18. 
  32. ^ "Support - How do I compose and send a text message to a Sprint or Nextel customer from email?". Retrieved 2008-09-18. 
  33. ^ "Answers to FAQs - Verizon Wireless Support". Retrieved 2008-09-18. 
  34. ^ BT trials mobile SMS to voice landline, January 2004, The Register.
  35. ^ [1], September 2006, SMStextnews
  36. ^ SMS Tutorial: Introduction to AT Commands, Basic Commands and Extended Commands
  37. ^ Solutions to the GSM Security Weaknesses,Proceedings of the 2nd IEEE International Conference on Next Generation Mobile Applications, Services, and Technologies (NGMAST2008), pp.576-581, Cardiff, UK, September 2008, PDF
  38. ^ SSMS - A Secure SMS Messaging Protocol for the M-Payment Systems, Proceedings of the 13th IEEE Symposium on Computers and Communications (ISCC'08), pp. 700-705, July 2008 PDF
  39. ^ An Analysis of Vulnerabilities in SMS-Capable Cellular Networks: Exploiting Open Functionality in SMS-Capable Cellular Networks (Website)
  40. ^ An overview on how to stop SMS Spoofing in mobile operator networks (September 9, 2008)

External links


Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary







  1. Short Message Service, a service for sending text messages on a cellular telephone system.
  2. (video games) Sega Master System.
  3. (numismatics) special mint set
  4. (psychology) short man syndrome
  5. (military, nautical) SMS — Seiner Majestät Schiff – literally, "His Majesty's Ship" in German




SMS (plural SMSes)

  1. A text message sent on a cell phone.



to SMS

Third person singular

Simple past

Past participle

Present participle

to SMS (third-person singular simple present SMSes, present participle SMSing, simple past and past participle SMSed)

  1. To send a message on a cell phone.
    I SMSed him and asked why he is late.
    I can't talk to her: she is too busy SMSing her friends.



See also


  • Anagrams of mss
  • SSM




  1. SMS




  1. SMS




  1. (nautical, military) SMS — Seiner Majestät Schiff, His Majesty's Ship

Usage notes

Used for naval ships of the Austro-Hungarian Empire and the Second Reich of Imperial Germany, for the Kaiserliche und Königliche Kriegsmarine and Kaiserliche Marine, respectively.

Strategy wiki

Up to date as of January 23, 2010
(Redirected to Category:Sega Master System article)

From StrategyWiki, the free strategy guide and walkthrough wiki

Sega Master System
The logo for Sega Master System.
The console image for Sega Master System.
Manufacturer Sega
Active 19861992
Total Games 336 (60 present)
← Sega SG-1000 Sega Genesis →

The Sega Master System is an 8-bit, cartridge-based video game console that was manufactured by Sega and was first released in 1986. Its original Japanese incarnation was the Sega Mark III (although the "Master System" name has also been used in Japan). In the European market, this console launched Sega onto a competitive level comparable to Nintendo, due to its wider availability, but failed to put a dent in the North American and Japanese markets. The Master System was released as a direct competitor to the NES/Famicom. Despite its shaky performance in the major territories, it enjoyed over a decade of life in smaller markets.

The later Sega Game Gear is effectively a hand-held Master System, with a few enhancements.

The Master System II was released in 1990, and was popular in Europe and Brazil. It is smaller and sleeker, but in order to keep production costs low, it lacks the reset button, composite video and card slot of the original. All consoles included a game that plays when no cartridge is inserted. The built-in game was originally Alex Kidd in Miracle World, which was switched to Sonic the Hedgehog on later PAL consoles.



With the use of the Sega Power Base Converter, all peripherals are fully compatible with the Sega Mega Drive.


There are a variety of different controllers which can be used with the Master System. Depending on the game, one controller can potentially offer greater control and/or responsiveness. The basic controller has just a directional pad and two buttons; the first button doubles as the start button, and the pause button is found on the main unit. An upgraded version, called the SG Commander, has the same functions with the addition of rapid-fire options for either button. Some other controllers are the Control Stick, for greater movement precision; the Sports Pad, which is required for some games, but not supported in most; and the Handle Controller, for racing and flying games.

Light Phaser

The Light Phaser is a light gun created for the Sega Master System, modeled after the Zillion gun from the Japanese anime series of the same name. The phaser is heavier than its Nintendo counterpart, the Nintendo Zapper and is considered by some to have a more responsive trigger and more accurate targeting. As with the Nintendo Zapper, the Light Phaser looked realistic enough to warrant parental pressure to alter the device so that police would not confuse it with a real gun. Altered Light Phasers are distinguished by a hand-painted neon orange tip and are much rarer than their solid color counterparts. Tec Toy also released a blue Light Phaser in Brazil.

Power Base Converter

The Mega Drive/Genesis is backwards compatible with the Master System, despite having a differently shaped cartridge slot. Sega developed a pass-through device for the Mega Drive/Genesis, allowing Master System cartridges to be played on the newer system. It was called the Power Base Converter in the US, the Mega Adapter in Japan and the Master System Converter in Europe. The somewhat large device plugs into the Mega Drive's cartridge slot, covering the entire circular top of the system. Master System cartridges and cards can then be inserted into the device and played on the Mega Drive using Mega Drive controllers. Due to its size and shape, the converter will not fit properly with the Mega Drive II, necessitating the use of the Europe-only Master System Converter II, or a third-party converter cartridge.

Rapid Fire Unit

The Rapid Fire Unit allows you to add rapid-fire functionality to the standard Control Pad, the Control Stick and the Light Phaser. Rapid-fire is useful in shooter games, such as R-Type, the first Sega Master System to have rapid-fire compatibility.

SegaScope 3-D Glasses

The 3-D Glasses use small LCD screens to rapidly alternate between the left and right lenses being opaque, used in tandem with two different alternating images flashed from the TV synchronized with the switching of the 3-D Glasses to create a natural stereoscopic 3D effect. The Master System glasses can only be used in the original Master System, since it hooks up directly to the card port not found in the Master System II. Such a system allows 3-D graphics in full color. The technology takes advantage of the fact that televisions display an interlaced image, displaying the left image in the top frame and the right image in the bottom frame, so it tends not to work with non-standard televisions and most capture cards, which tend to combine fields. The same technique has been used with similar glasses for some 3-D films in movie theaters, though these have largely been replaced by newer methods that would not work on a home TV. Only eight Master System games are 3-D compatible.

Simple English

A mobile receiving a text message.

An SMS, or short messaging service is a type of communication used in mobile phones. They are more commonly called 'text messages'. With SMS, someone can send text to another person.

SMS can be slow, as normal calls take priority over sending text messages on a network (which mean that they come first). There is also a limit of 160 characters that a text message can send.[1] Longer messages than this will be sent as multiple messages, where the sender has to pay for each individual message.

Text messages are often sent between phone users when an actual phone call is not wanted or needed. For example, they may be used in a situation where silence is needed, or to send something private that one person does not want people near them to hear. Message price depends on the phone network of the user. Some mobile phone plans allow for unlimited texting.


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