so i'm torn between activating a new line with Sprint ($80 monthly) and getting the iPhone5 for LTE coverage (i'm in NYC) or simply going no contract paying full price upfront and unlocking so I can stay on my mother's tmobile plan (currently pay $60 monthly) and waiting out for the 4g rollout supposedly coming later this year. the catch is that i'm 18 years old and I've been told it's a good idea to start up my own phone bill that way I can build my own credit. every other carrier is out of reach, unless their cheaper and similar better then tmobile.