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IMEI
The International Mobile Equipment Identity (IMEI) is a numeric identifier, usually Unique identifier, unique, for 3GPP and iDEN mobile phones, as well as some satellite phones. It is usually found printed inside the battery compartment of the phone but can also be displayed on-screen on most phones by entering the Unstructured Supplementary Service Data#Code table, MMI Supplementary Service code *#06# on the dialpad, or alongside other system information in the settings menu on smartphone operating systems. GSM networks use the IMEI number to identify valid devices, and can stop a stolen phone from accessing the network. For example, if a mobile phone is stolen, the owner can have their network provider use the IMEI number to blocklist the phone. This renders the phone useless on that network and sometimes other networks, even if the thief changes the phone's subscriber identity module, SIM card. Devices without a SIM card slot or eSIM capability usually do not have an IMEI, exc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central Equipment Identity Register
A Central Equipment Identity Register (CEIR) is a database of mobile equipment identifiers (IMEI – for networks of GSM standard, MEID – for networks of CDMA standard). Such an identifier is assigned to each SIM slot of the mobile device. Different kinds o IMEIs could be, White, for devices that are allowed to register in the cellular network; Black, for devices that are prohibited to register in the cellular network; and Grey, for devices in intermediate status (when it is not yet defined in which of the lists - black or white - the device should be placed). Depending on the rules of mobile equipment registration in a country the CEIR database may contain other lists or fields beside IMEI. For example, the subscriber number (MSISDN MSISDN ( ) is a number uniquely identifying a subscription in a Global System for Mobile communications or a Universal Mobile Telecommunications System mobile network. It is the mapping of the telephone number to the subscriber identity module in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mobile Phone
A mobile phone or cell phone is a portable telephone that allows users to make and receive calls over a radio frequency link while moving within a designated telephone service area, unlike fixed-location phones ( landline phones). This radio frequency link connects to the switching systems of a mobile phone operator, providing access to the public switched telephone network (PSTN). Modern mobile telephony relies on a cellular network architecture, which is why mobile phones are often referred to as 'cell phones' in North America. Beyond traditional voice communication, digital mobile phones have evolved to support a wide range of additional services. These include text messaging, multimedia messaging, email, and internet access (via LTE, 5G NR or Wi-Fi), as well as short-range wireless technologies like Bluetooth, infrared, and ultra-wideband (UWB). Mobile phones also support a variety of multimedia capabilities, such as digital photography, video recordin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Approvals Board For Telecommunications
The British Approvals Board for Telecommunications (BABT) is a telecommunications certification body. History State monopoly It was established in July 1982 by the UK government to provide type approval services to the telecommunications terminal industry. At that point in history, British Telecom was a state monopoly, and even by 1982 BT only allowed (via approval) the four British manufacturers ( STC, GEC, Plessey, and the " Thorn-Ericsson" partnership) to supply its twenty five types of phone through them, and not independently. However around 200,000 unapproved, independently bought phones were being used on the network. Loyalty to BT was of importance (commercially sensitive) to STC, Plessey and GEC as equipment for BT's exchanges was made exclusively by them. In the same year, BT was becoming more commercially minded, opening up around one hundred new BT Phone Shops having become separated from the GPO through the British Telecommunications Act 1981 which also create ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GSM Association
The GSM Association (GSMA) is a non-profit trade association that represents the interests of mobile network operators worldwide. More than 750 mobile operators are full GSMA members and a further 400 companies in the broader mobile ecosystem are associate members. History The GSMA was formed in 1995 as the GSM MoU Association as a body to support and promote mobile operators using the GSM (Global System for Mobile communications) standard for cellular networks. It traces its history back to a memorandum of understanding signed in 1987 by 13 operators in 12 countries that committed to deploying GSM for mobile services. Membership and governance Full membership of the GSMA is open to licensed mobile operators using a GSM family technology. Approximately 750 such operators around the world are full GSMA members. Associate membership of the GSMA is open to non-operator companies active in the mobile ecosystem. These include handset and device makers, software companies, equi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subscriber Identity Module
A typical SIM card (mini-SIM with micro-SIM cutout)A SIM card or SIM (subscriber identity module) 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 (such as mobile phones, tablets, and laptops). SIMs are also able to store address book contacts information, and may be protected using a PIN code to prevent unauthorized use. SIMs are always used on GSM phones; for CDMA phones, they are needed only for LTE-capable handsets. SIM cards are also used in various satellite phones, smart watches, computers, or cameras. The first SIM cards were the size of credit and bank cards; sizes were reduced several times over the years, usually keeping electrical contacts the same, to fit smaller-sized devices. SIMs are transferable between different mobile devices by removing the card itself. Technically, the actual physic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nokia 5110
The Nokia 5110 is a GSM mobile phone that was introduced by Nokia on 12 April 1998. The 5110 was intended for the consumer market, succeeding the Nokia 3110 (1997) and the analogue Nokia 232 (1994), and it based on the same platform (DCT3) as the business-oriented Nokia 6110, giving it additional features such as games and alarm clock. The Nokia 5110 was discontinued by the year 2000, having been fully replaced by the smaller Nokia 3210. The 5110 is also known as the Nokia 5146 on One2One or the nk402 on Orange in the UK. Features The Nokia 5110 features an 84×48-pixel monochrome LCD with four LED backlights, operated by the Philips PCD8544 display controller. Its design is based on the same platform as Nokia 6110 for the business market. It features a similar, simpler, revamped user interface called Series 20, but lacked the infrared data interface. It can, however, be interfaced with a computer via a cellular data card and a proprietary cable, enabling it to funct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Mobile Subscriber Identity
The international mobile subscriber identity (IMSI; ) is a number that uniquely identifies every user of a cellular network. It is stored as a 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. The IMSI is used in ''any'' mobile network that interconnects with other networks. For GSM, UMTS and LTE networks, this number was provisioned in the SIM card and for cdmaOne and CDMA2000 networks, in the phone directly or in the R-UIM card (the CDMA equivalent of the SIM card). Both cards have been superseded by the UICC. An IMSI is usually presented as a 15-digit number but can be shorter. For example, MTN South Africa's old IMSIs that are still in us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unstructured Supplementary Service Data
Unstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator's computers. USSD can be used for WAP browsing, prepaid callback service, mobile-money services, location-based content services, menu-based information services, and as part of configuring the phone on the network. The service does not require a messaging app, and does not incur charges. USSD messages are up to 182 alphanumeric characters long. Unlike short message service (SMS) messages, USSD messages create a real-time connection during a USSD session. The connection remains open, allowing a two-way exchange of a sequence of data. This makes USSD faster than services that use SMS. While GSM is being phased out in the 2020s with 2G and 3G technologies, USSD services can be supported over LTE and 5G. Uses When a user sends a message to the phone company ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Library Of Congress
The Library of Congress (LOC) is a research library in Washington, D.C., serving as the library and research service for the United States Congress and the ''de facto'' national library of the United States. It also administers Copyright law of the United States, copyright law through the United States Copyright Office, and it houses the Congressional Research Service. Founded in 1800, the Library of Congress is the oldest Cultural policy of the United States, federal cultural institution in the United States. It is housed in three buildings on Capitol Hill, adjacent to the United States Capitol, along with the National Audio-Visual Conservation Center in Culpeper, Virginia, and additional storage facilities at Fort Meade, Fort George G. Meade and Cabin Branch in Hyattsville, Maryland. The library's functions are overseen by the librarian of Congress, and its buildings are maintained by the architect of the Capitol. The LOC is one of the List of largest libraries, largest libra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
T-Mobile US
T-Mobile US, Inc. is an American wireless network operator headquartered in Bellevue, Washington. Its majority shareholder and namesake is the German telecommunications company Deutsche Telekom. T-Mobile is the second largest wireless carrier in the United States, with 131 million subscribers as of March 31, 2025. The company was founded in 1994 by John W. Stanton of the Western Wireless Corporation as VoiceStream Wireless. Deutsche Telekom then gained plurality ownership in 2001 and renamed it after its global T-Mobile brand. , the German company holds a 51.4% stake in the company. T-Mobile US operates two main brands: T-Mobile and Metro by T-Mobile (acquired in a 2013 reverse takeover of MetroPCS that also led to T-Mobile's listing on the NASDAQ). In 2020, T-Mobile expanded through the acquisition of Sprint, which also made T-Mobile the operator of Assurance Wireless, a service subsidized by the federal Lifeline program. The company's growth continued in 2024 wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2002 Bali Bombings
The 2002 Bali bombings were a series of terrorist attacks on 12 October 2002 in the tourist district of Kuta on the Indonesian island of Bali. The attacks killed 202 people (including 88 Australians, 38 Indonesians, 23 Britons, and people of more than 20 other nationalities) and injured a further 209. General Da'i Bachtiar, the National Police Chief at the time, said that the bombings was the "worst act of terror in Indonesia's history". Various members of Jemaah Islamiyah (also abbreviated JI), a violent Islamist group, were convicted in relation to the bombings, including three who were sentenced to death. The attack involved the detonation of three bombs: a backpack-mounted device carried by a suicide bomber; a large car bomb, both of which were detonated in or near popular Kuta nightclubs; and a third, much smaller device detonated outside the United States consulate in Denpasar, causing only minor damage. On 9 November 2005, one of the top JI's bomb-makers, form ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
