The international mobile subscriber identity is a number that uniquely identifies every user of a cellular network. It is stored as a 64-bit field and is sent by the mobile device to the network. It is also used for acquiring other details of the mobile in the home location register (HLR) or as locally copied in the visitor location register. To prevent eavesdroppers from identifying and tracking the subscriber on the radio interface, the IMSI is sent as rarely as possible and a randomly-generated TMSI is sent instead.
A SIMcard is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices. SIMs are also able to store address book contacts information, and may be protected using a PIN code to prevent unauthorized use.
A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks. This is in contrast to a phone that does not impose any SIM restrictions.
Celcom Axiata Berhad was the oldest mobile telecommunications provider in Malaysia. Celcom was a member of the Axiata group of companies. Celcom was merged with Digi to form CelcomDigi on 1 December 2022.
Telekom Romania Mobile Communications S.A. is a mobile network company in Romania, wholly owned by OTE, which in turn is controlled by Deutsche Telekom, operating under Telekom brand. Telekom Romania Mobile had 3.5 million subscribers with 15% market share as of July 2021.
Fido Solutions Inc. is a Canadian mobile network operator owned by Rogers Communications. Since its acquisition by Rogers in 2004, it has operated as a Mobile virtual network operator (MVNO) using the Rogers Wireless network.
GSM services are a standard collection of applications and features available over the Global System for Mobile Communications (GSM) to mobile phone subscribers all over the world. The GSM standards are defined by the 3GPP collaboration and implemented in hardware and software by equipment manufacturers and mobile phone operators. The common standard makes it possible to use the same phones with different companies' services, or even roam into different countries. GSM is the world's predominant mobile phone standard.
A prepaid mobile device, also known as a pay-as-you-go (PAYG), pay-as-you-talk, pay and go, go-phone, prepay, or burner phone, is a mobile device such as a phone for which credit is purchased in advance of service use. The purchased credit is used to pay for telecommunications services at the point the service is accessed or consumed. If there is no credit, then access is denied by the cellular network or Intelligent Network. Users can top up their credit at any time using a variety of payment mechanisms.
Digitel Mobile Philippines, Inc., doing business as Sun Cellular, was a wholly owned subsidiary of Digital Telecommunications Philippines (Digitel), which in turn was owned by PLDT and is one of the Philippines' largest mobile telecommunications companies. It was established by Digitel in September 2001 to provide wireless public and private telecommunications services. Sun Cellular was known for introducing unlimited call and text services in the Philippines.
Vodafone Greece is the Greek subsidiary of Vodafone Group Plc. In 2004 it was the leading mobile operator in Greece. Its headquarters are in Chalandri - one of the northern suburbs of Athens.
Wind Hellas was a Greek integrated telecommunications provider with headquarters in Athens, Greece.
Telephone numbers in the Philippines follow an open telephone numbering plan and an open dial plan. Both plans are regulated by the National Telecommunications Commission, an attached agency under the Department of Information and Communications Technology (DICT).
Emtel Ltd. is a telecommunications company based in Ebene City, Mauritius. Launched on 29 May 1989 – Emtel Ltd became the first mobile telephony operator in the Southern Hemisphere. This took place under the aegis of The Currimjee Jeewanjee Group.
The history of the prepaid mobile phones began in the 1990s when mobile phone operators sought to expand their market reach. Up until this point, mobile phone services were exclusively offered on a postpaid basis (contract-based), which excluded individuals with poor credit ratings and minors under the age of 18 In early 1991, Kenneth Johnson of Queens, New York along with Mark Feldman, Pedro Diaz and Kevin Lambright of Alicomm Mobile, was the first to successfully create a prepaid cellular phone and Network. His company expanded to a Sales force from Maine to Florida. Two years later others would come out with similar systems.
T-Mobile Polska S.A. is a Polish mobile phone network operator. The company was formerly named Polska Telefonia Cyfrowa and operated under the name Era, until being rebranded as T-Mobile on 5 June 2011. As in other European countries, the company operates a GSM network. Following a decade-long ownership dispute with the French Vivendi corporation, the company has been wholly owned by the German telecommunications provider Deutsche Telekom since 2010.
Brightroam is a deep discount international roaming mobile provider owned by iRoam Mobile Solutions a subsidiary of Sea Change Corporation. The company is headquartered in Toronto, Ontario, Canada and provides global cellular communications to corporations and individuals at reduced costs associated with international roaming.
With prepaid mobile phone service, topping-up or reloading is needed to continue using the services of the operator. There are several ways to reload a prepaid mobile phone. The most common approach involves purchasing a prepaid card. However, due to security concerns and for added convenience, electronic reloading has been developed.
3G mobile telephony was relatively slow to be adopted globally. In some instances, 3G networks do not use the same radio frequencies as 2G so mobile operators must build entirely new networks and license entirely new frequencies, especially so to achieve high data transmission rates. Other delays were due to the expenses of upgrading transmission hardware, especially for UMTS, whose deployment required the replacement of most broadcast towers. Due to these issues and difficulties with deployment, many carriers delayed acquisition of these updated capabilities.
ABS-CBN Mobile was a cellular telephony service provider in the Philippines owned and operated by ABS-CBN Convergence, a subsidiary of ABS-CBN. ABS-CBNmobile formerly uses the network infrastructures of Globe Telecom under a network-sharing agreement which allows ABS-CBN and Globe to share frequencies, switches, servers, and transmitters. ABS-CBNmobile formerly offers prepaid and postpaid SMS, voice, data, wireless landline connection, and access to premium and exclusive contents of iWant TV.
Idea Cellular was an Indian telecommunications company based at Mumbai, Maharashtra. It was an integrated GSM operator and had 220.00 million subscribers as of June 2018.
