Well, here is a quick chart that CNN Money put together to compare the cost for both Verizon and AT&T based on the amount of data used. This basically goes out the window if you have the option to continue your unlimited data plan with AT&T with your iPad 2.
Another thing to consider is that AT&T has poorer service in some areas, but is much faster than Verizon on average. This decision needs to be made as the iPad is different for each network...this decision needs to be made while purchasing the iPad 2 and cannot be just easily swapped back and forth after purchase of the device.
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