iPhone 4S Carrier Quality: AT&T Wins for Data Speed, Verizon for Call Reliability: The iPhone 4S is available on three major carriers, leaving potential buyers to wonder whether AT&T, Verizon or Sprint is the better network choice. Pricing plans aside, carrier is a significant factor in anyone's purchasing decision, and now consumers have hard data to help them choose: A just-released study reports AT&T is tops for fast data speeds, while Verizon is the most reliable when it comes to making phone calls.
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