I recently learned that they're offering iPhones on the T-mobile network, but the prices are outrageous. Is there a way i could purchase a used iPhones and make it work on the T-mobile network (Legally)?
Buy an iPhone that's used and from AT&T, then get AT&T to unlock it. Or better yet find one already unlocked. Don't get a Verizon or Sprint iPhone, because they can't really be unlocked and someone who says they have one that's unlocked is confused or a liar.
Did you mean you to use T-Mobile network service on your other than T-Mobile network locked phone?
Yes means,Your iphone should be unlocked to use T-Mobile service on your phone.For unlocking visit SuperUnlockCodes.com Here you can unlock your iphone by Remote unlocking method without jailbreaking.