currently at work so i wouldnt be able to provide them with the IMEI number, but some research fromt he ATT site shows there should be no problem:
What are the eligibility requirements for unlocking iPhone?
All requests for iPhone unlock must meet general iPhone unlock eligibility requirements before an iPhone can be unlocked.
AT&T will unlock an iPhone under the following circumstances:
- The person requesting the unlock is:
- A current AT&T customer, or
- A former AT&T customer who can provide the phone number or account number for the account.
- The iPhone was designed for use on the AT&T network.
- All contract obligations, including any term commitment, associated with the device to be unlocked have been fully satisfied.
- The iPhone has not been reported lost or stolen.