Can I get my iPhone to work on the T-Mobile network?
If you have a GSM iPhone which is free from network restriction, You can definitely use it with T-Mobile network just by inserting the SIM card.
If you have any GSM network locked iPhone (other than T-mobile network), You need to unlock it from network restriction. You can unlock an iPhone safer and easier using remote unlocking service. You can get the remote unlocking service for an iPhone from www.superunlockcodes.com at affordable cost with free unlocking instructions. This is a permanent unlocking method and doesn’t require a jailbreak too. Good luck.