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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. US Mobile - Wikipedia

   en.wikipedia.org/wiki/US_Mobile

   US Mobile. US Mobile is an American mobile virtual network operator (MVNO) that uses the T-Mobile, Verizon Wireless, and AT&T networks (branded as "Light Speed", "Warp", and "Dark Star" respectively) to provide talk, text, and data services to their customers. The company was ranked 94th in the Inc 5000's fastest growing private companies with ...

5. Cell phone data plan comparison: AT&T, Sprint, T-Mobile ... - AOL

   www.aol.com/2010/10/28/cell-phone-data-plan...

   Cell phone data plans are hard to escape these days as hundreds of thousands of Google Android phones and Apple iPhones are activated every day. These smartphones bring access to the Web ...

6. 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.

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