T-mobile have the lowest family plan so I'm consider switching. 1. How good is their coverage and speed???? Sprint have horrible speed 2. Can I use my sprint iphone 5 on t mobile network? According to their website I can. I don't want a phone that gives me limit access to tmobile network. WHy is it so freaking cheap???? hidden fees/chargers???? If the plan cost 130$ what am I looking at after tax and fees?