Dataplan on IPhone for at&t?

A few questions.
1.Is there a dataplan for the iPhone(8gb) for at&t? If so, how much?
2.Is there a dataplan for phones similar to the iphone, like android? If so how much?
3.Is there a dataplan for the iPhone for Verizon? If so how much?
4. Could I switch to Verizon without a penalty from AT&T if my contract hasn't ended yet?

1.Is there a dataplan for the iPhone(8gb) for at&t? If so, how much?
--- all smartphones on ATT have the same data plan… $30/mo for 3GB

http://www.att.com/...ZtS6-r6xi4" class='ext_link'>http://www.att.com/...ZtS6-r6xi4

2.Is there a dataplan for phones similar to the iphone, like android? If so how much?
--- all smartphones on ATT have the same data plan… $30/mo for 3GB

http://www.att.com/shop/wireless/data-plans.html#fbid=pZtS6-r6xi4

3.Is there a dataplan for the iPhone for Verizon? If so how much?
--- all smartphones on Verizon have the same data plan… $60 for unlimited talk and text with 2GB of DATA

http://www.verizonwireless.com/...thing.html

4. Could I switch to Verizon without a penalty from AT&T if my contract hasn't ended yet?
--- no… Ending a contract early (switch carriers) will result in a $60-$350 Early Termination Fee (ETF FEE), depending on how much time you have left in your current ATT contract