You can do it online or over the phone. Even in the stores. Be sure to get the next best phone while you renew that contract.
Either visit a ATT store and renew it or find a new provider
You stay on the contract, however your next renew date will be another 2 years.
You have to get a contract.
One reason to not renew a contract is if the rates or terms change.
tips how to make notification letter not to renew contract
there contract has not expired yet
Yes, a contract is binding to both parties for the duration of the contract, but when it is over, neither party is required to renew.
2010
It depends on the plan you have. Check your contract agreement.
An unlocked phone can accept the SIM card from any cell phone provider. If you have an ATT SIM card, you can use it in an unlocked phone. A locked phone is created by the provider to force the use of its service; an unlocked phone can take any SIM card.
"So you are saying that. I can renew this anytime?"
There is not enough detail in this question. Your 2 year contract was for ... what? Is it not possible to renew the contract?