My plan is now expired and i want to get a new phone. Sadly, the one i want is not offered.
I want a Sony Ericson Neo. So can i just buy it and upgrade my plan?
If you buy the phone, you do not need to upgrade your plan unless you need data? If you bring your own phone, you do not need to sign a new contract. ATT will provide you with a SIM to use. Just make sure the version you buy is unlocked so that it works on ATT's network.
For service or support questions including existing order status, call: Customer Support: 1-800-331-0500
Information on iPhone unlocking can be found here by copying this link into your browser: https://www.att.com/deviceunlock/client/en_US/