Seth Weintraub over at 9to5Mac heard from a T-Mobile USA spokesman that their network is already home to over 1 million iPhones, and this is without the benefit of an Apple contract, T-Mobile supplied micro-SIMs, or support for their AWS 3G/4G bands. That means, right now, there are over a million people willing to jailbreak and unlock, or buy an unlocked model, manually cut their SIM cards, and go 2G EDGE only just to be on T-Mo with their iPhones.
There have been rumors that iPhone 5 would support T-Mobile's AWS HSPA and HSPA+ bands, and AT&T is trying to buy T-Mobile and if that goes through, it probably means iPhones for everyone.
If a million customers are willing to go to the effort of doing it on their own, how many would go iPhone if it was officially offered?
Are you running your iPhone on T-Mo? If so, how's it working for you?