A prototype iPhone 4 with T-Mobile 3G has been spotted and photographed, suggesting Apple is considering adding the carrier as a third option in the U.S. Boy Genius Report states that the prototype carries an internal model number of N94, different from the N92, which is the Verizon iPhone, and N90, which is the standard GSM variant of the iPhone 4. Although T-Mobile USA uses the GSM standard, its 3G bands are of a different frequency than most other…
