Do I need to unlock an iPhone 4 to use it on the T-Mobile network?

[MrNinjaManners]

I know that recently that At&t bought T-Mobile, does this mean that I'll still have to unlock my iPhone 4 to make it work with the T-Mobile network? Or will using any non-contract iPhone 4 work with T-Mobile?

[vicecaptain]

Since T-Mobile doesn't provide iPhone, You must either use a non contract iPhone or unlock any other GSM network locked iPhone. If it is an AT&T iPhone also you must unlock it before using it with T-Mobile. You can unlock an AT&T network locked iPhone using remote unlocking service. This method of unlocking is safe, simple, affordable and quick. you can get the remote unlocking for an iPhone 4 from www.simpleunlocking.com/apple-iphone-4/rs16wp9/ at low cost with easy unlocking instructions. This method of unlocking doesn't require a jailbreak too. All the best mate.