IPhone unlocking?

Question

I have T-Mobile and I can't switch to AT&T, but I just got a new iPhone (from a friend) and I heard that you can unlock the iPhone and I can still use it with my T-Mobile SIM card. So can someone explain to me what exactly unlocking the iPhone means? I don't understand. And also if I unlock it and use it with my T-Mobile can I still use everything on the iPhone properly?

Answer 1

go to www.ziphone.com and download the program ziphone it will unlock your phone in less than a minute.  If u need other help go to youtube and search "ziphone tutorials".  Otherwise it's rellllly easy