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Panda, you are correct. It is a bit early and 3G is not going away any time soon, however carriers have already started to test and deploy VoIP. MetroPCS, for example, announced earlier this year that they plan on deploying VoIP in select markets for 2012. AT&T already has an application...

iPhone 4S only supports 3G technology, which on your AT&T phone is UMTS. AT&T, Sprint and Verizon are all in various stages of upgrading their networks to 4G (Long Term Evolution) technology. LTE uses the existing radio frequency spectrum more efficiently and is able to compress millions of data...