While there are many phone manufacturers, only a handful of companies provide cellular services. The selection process has a few chicken and egg components. For example, if you want an iPhone, services such as BlackBerry and Microsoft do not support it. If you want to use Sprint, make certain that it supports the device you want. For example, Apple's new iPads are only supported by AT&T and Verizon. In fact there are two different models - one for AT&T and another for Verizon.
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