What I am asking is can I just get a Blackberry Curve 8320 from Ebay, used, and put my SIM card in it before my contract expires, then ask my dad to call AT&T and cancel the data, I do not really care that I cannot use all of the functions on the Blackberry I just think they are cool, and I am 13 so do not judge me!
This is what one dude said: You can get the phone whenever you want. You won't get a full discount on the phone if your contract isn't up. If you don't want to sign (or resign) a contract, then you will be required to buy the phone for full price.
If you buy the phone from another place (such as Ebay), then all you have to do is take it to AT&T and have them activate it on your account (you do not have to have a contract to have an account).
You can use any phone without a data plan. You can change any phone on your account whether you have a contract or not. The only thing the contract states is that you will stay with the provider for a set amount of time, or pay a fee to cancel before the time is up. Once your contract is up, you do not have to sign another contract. Most people do to get the phone at a discounted price.
I have gone for years without a contract. I recently got a new phone, and signed another contract. When it is up, I will not have another contract until another phone comes along that is a must have for me. I will then sign another contract to get the phone at a discounted price.