T-Mobile remains the only U.S. carrier that doesn’t get to sell the iPhone, but more than a million unlocked iPhones are running on its network, many of them using a Micro SIM Card offered by the Bellevue-based company.

Up to this point, the iPhone was limited to the Edge (2G) network on T-Mobile. Now, however, users are reporting from various pockets of the country that they’re seeing 3G signals and speeds on their iPhones on T-Mobile’s network, as noted over the weekend by Electronista and PhoneArena.com.

Speed tests posted by one HowardForums user, for example, show an iPhone running on T-Mobile with download speeds of nearly 8 Mbps.  TmoNews.com offers a detailed technical breakdown of what’s happening behind-the-scenes on the network.

With its acquisition by AT&T pending over the past year, T-Mobile was left in the cold as Verizon and Sprint both joined AT&T in selling the iPhone. Now, that acquisition bid is in limbo, leaving T-Mobile’s future even more uncertain.