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The two leading digital mobile phone technologies in the United States, and some parts of the world, are [[CDMA]] and [[GSM]]. These are competing technologies that are not compatible nor interchangeable. They're the reason you can't use AT&T phones on Sprints' network or Verizon’s and vice versa.The two leading digital mobile phone technologies in the United States, and some parts of the world, are [[CDMA]] and [[GSM]]. These are competing technologies, "[[CDMA vs GSM]]," that are not compatible nor interchangeable. They're the reason you can't use AT&T phones on Sprints' network or Verizon’s and vice versa.[[Category:Android]][[Category:Verizon]][[Category:Mobile Phones]]