The fine print? Do they happily tell you the outrageous local, state, federal taxes that are charged as well BEFORE you sign up? I don't think so...fine print for the monthly cost is easily calculated. However, they don't disclose the typical tax added which can exceed and additional $25-$30 a month!
Guess what? You're going to be paying those same fees at T-Mobile or any carrier and they probably won't disclose those to you either. They're government fees and taxes. Charged by the government. Every carrier will have them.