Becasue each case is handled individually, it is best to see for yourself. However, the nicer you ask the more likely the reps may do something. Locking in a line for another two year under the right circumstances is a good thing for ATT.
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/