I been saving for a iPhone 5 and my parents have said that I have to pay and get on my own plan and i was thinking from my parents being on metropcs to t-mobile no contract unlimited. But recently i heard of unlocking a phone and i researched that a little. But also t-mobile and metropcs have had their merger and i have had that on my mind. Basically does having the phone on T-mobile or unlocking the phone to use on metropcs affect overall speed of the phone?