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A typical SIM card (mini-SIM with micro-SIM cutout) T-Mobile nano-SIM card with NFC capabilities in the SIM tray of an iPhone 6s cell phone A SIM (Subscriber Identity Module) card 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 ...
Prepaid mobile phone. 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 ...
Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the three major cellular carriers in the countryv—AT&T Mobility, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.
94 mm × 55 mm × 19 mm (130) Weight. 88 g. Display. Digital: LCD. AMPS (analog): Segment LED, Alphanumeric LED. The StarTAC is a series of mobile phones released by Motorola starting in 1996. It is the successor of the MicroTAC, a semi- clamshell design first launched in 1989. [2] Whereas the MicroTAC's flip folded down from below the keypad ...
Assurance Wireless. Assurance Wireless USA, L.P.[ 1 ] is a telephone service subsidized by the federal Lifeline Assistance program, a government benefit program supported by the federal Universal Service Fund. The service provides to low-income eligible people a free phone, [ 2 ][ 3 ] free monthly data, unlimited texting, and free monthly minutes.
GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM. Time-division multiple access (TDMA) provides multiuser access by chopping up the channel into sequential time slices. Each user of the channel takes turns to transmit and receive signals.
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