I have an iPhone with AT&T. I will be swithcing but... I'm going to be wait until after June's Macworld. I'd guess that will be when the 4G phones will be announced with the release in late-June or July. I've gotten used to being able to talk on the phone and send text messages/emails or use other programs that require connecting to the network.
As of right now, I see the only benefits of switching to Verizon being a possible reduced price (they haven't release plan pricing yet) and better service. Staying with AT&T will provide faster service (when you actually have it) and the ability to talk on the phone while also using apps that need to connect to their network.
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