Ahead of the next-generation iPhone’s launch, AT&T is offering to unlock iPhones for AT&T customers who have fulfilled their contracts, so long as the iPhones were not reported as stolen. Users can fill out a request form to unlock an AT&T iPhone, and will receive a response from the company within several days. According to one report, some iPhone users with current contracts have had success, as well. [via Ubergizmo] Spurned by…