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2. Comparison of mobile phone standards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_mobile_phone...

   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.

3. List of mobile network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_network...

   AT&T, T-Mobile, Verizon, Boost Mobile, and UScellular also sell SIM cards through their retail channels, both in-store and online. The top five wireless providers operate nationwide wireless networks which cover most of the population in the United States, while smaller carriers provide native network coverage across selected regions of the ...

4. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   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.

5. List of mobile network operators - Wikipedia

   en.wikipedia.org/wiki/List_of_mobile_network...

   Czech Republic (T-Mobile CZ) Germany (Deutsche Telekom) Greece ; Hungary (Magyar Telekom) Montenegro (Crnogorski Telekom) North Macedonia (Makedonski Telekom) Poland (T-Mobile PL) Puerto Rico (T-Mobile US) Romania (Telekom Romania) Slovakia (Slovak Telekom) United States (T-Mobile US) United States Virgin Islands (T-Mobile US)

6. GSM - Wikipedia

   en.wikipedia.org/wiki/GSM

   A nano sim used in mobile phones. One of the key features of GSM is the Subscriber Identity Module, commonly known as a SIM card. The SIM is a detachable smart card [2] containing a user's subscription information and phone book. This allows users to retain their information after switching handsets.

7. Motorola StarTAC - Wikipedia

   en.wikipedia.org/wiki/Motorola_StarTAC

   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 ...