When can I cancel my ATT contract?

I want to cancel my ATT plan. My contract expires 11/18 or 11/28. If I want to switch with Verizon, when can I start the process?

I want to go ahead and get the new iPhone 5 with a new 2 year agreement.

Find out the exact day that your contact ends and cancel on that day. If you want to keep your phone number you need to port the number to Verizon on the exact day that your contract ends so you do not have to pay for a month of your phone bill that you will not have service on your phone.

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