"GSM and UMTS technology is widely used worldwide. UMTS phones can be easily moved from one UMTS network to another, making them ideal for international use. [CDMA] can't use a SIM card, making it far more difficult to switch handsets.
Calls: In general, Verizon will drop less calls. It's unclear what impact the iPhone will have on its network, but we don't expect it to be as bad as AT&T was in its early years. Verizon's network has proven itself to be more robust.
Speed: In general, AT&T has the faster 3G network, and in some cases it's a great deal faster than Verizon.
Simultaneous voice and data: Only AT&T is capable of talking on the phone and surfing the web at the same time, but Verizon is working on a solution, saying the fix might be implemented by the end of this year."
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