The device, reports BGR, is running a "test version" of iOS 4 and "includes internal Apple test apps like Radar and Apple's employee directory app."
Though this supposed tester unit resembles the forthcoming white iPhone 4, BGR speculates that it's only a mock-up.
"[W]e'd wager that Apple is just testing the new T-Mobile-friendly radio with its current iPhone 4 hardware, possibly in preparation for integration in a future device."
Since AT&T announced plans to acquire T-Mobile, some have wondered whether Apple's blockbuster handset would be making its way to T-Mobile. The carrier has not offered any hints so far.
Will this mysterious white iPhone find its way to T-Mobile's shelves?
9to5Mac believes this unit to the the 'iPhone 4S' tester unit that Apple has distributed to developers. The '4S' reportedly houses a dual-core A5 processor, which will boost performance and enhancing gaming.
Check out a photo of the T-Mobile iPhone (below), courtesy of Boy Genius Report. Do you think the iPhone is coming to T-Mobile? Weigh in using our quick poll.
Hungry for more? Feast on our iPhone 5 rumor guide.
LOOK: [via BGR]