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Two basic technologies in mobile phones, CDMA and GSM represent a gap you can't cross. They're the reason you can't use AT&T phones on Verizon's network and vice versa. But what does CDMA vs. GSM really mean for you? For more info, check out our full guide on PCMag: http://www.pcmag.com/article2/0,2817,2407896,00.asp
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