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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. iPhone (1st generation) - Wikipedia

   en.wikipedia.org/wiki/IPhone_(1st_generation)

   The iPhone[ 10] (retroactively referred to as the iPhone 2G, [ 11] iPhone 1, [ 12] or original iPhone[ 11]) is the first iPhone model and the first smartphone designed, developed, and marketed by Apple Inc. After years of rumors and speculation, it was officially announced on January 9, 2007, [ 13] and was released in the United States on June ...

4. iPhone 3GS - Wikipedia

   en.wikipedia.org/wiki/IPhone_3GS

   The iPhone 3GS, stylised as iPhone 3G🅂 [ a ] is a smartphone that was designed, developed, and marketed by Apple Inc. It is the third generation iPhone and the successor to the iPhone 3G. It was unveiled on June 8, 2009 [ 8 ] at the WWDC 2009 which took place at the Moscone Center in San Francisco.

5. Cellular frequencies in the United States - Wikipedia

   en.wikipedia.org/wiki/Cellular_frequencies_in...

   There are 51 MTAs, 493 BTAs and 175 EAs in the United States. The Advanced Wireless Services (AWS) bands, auctioned in the summer of 2006, were for 1,710–1,755 MHz, and 2,110–2,155 MHz. The spectrum was divided into blocks: A blocks were for Cellular Market Areas, based on existing cellular (1G) licenses, and were 2 × 10 MHz.

6. iPhone 4s - Wikipedia

   en.wikipedia.org/wiki/IPhone_4S

   The iPhone 4s[ a] is a smartphone that was designed, developed, and marketed by Apple Inc. It is the fifth generation of the iPhone, [ 12] succeeding the iPhone 4 and preceding the iPhone 5. It was announced on October 4, 2011, at Apple's Cupertino campus, and was the final Apple product announced in the lifetime of former Apple CEO and co ...

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

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

   The acronym BYOD means "Bring Your Own Device", indicating that a customer can port a cellphone or other cellular device they already own to the MVNO, rather than having to buy/rent a new device from them (assuming it is compatible with the host network, has not been reported stolen, is not still locked into a contract, etc.). MVNOs often ...

8. iPhone 11 - Wikipedia

   en.wikipedia.org/wiki/IPhone_11

   The iPhone 11 is a smartphone designed, developed, and marketed by Apple Inc. It is the thirteenth generation of iPhone, succeeding the iPhone XR, and was unveiled on September 10, 2019, alongside the higher-end iPhone 11 Pro at the Steve Jobs Theater in Apple Park, Cupertino, by Apple CEO Tim Cook. Preorders began on September 13, 2019, and ...

9. Cricket Wireless - Wikipedia

   en.wikipedia.org/wiki/Cricket_Wireless

   Cricket Wireless is an American prepaid mobile virtual network operator (MVNO), wholly-owned by AT&T. It provides wireless services to ten million subscribers in the United States. [ 1] Cricket Wireless was founded in March 1999 by Leap Wireless International. AT&T acquired Leap Wireless International in March 2014, and later merged Cricket ...