It depends where you are.I had T-mobile for 6 years and i have to say they suck(i travel very less). I live in the city but where i used to live before on the first floor i had to go outside to get service.I moved to a new apartment still same.I switched to ATT and noticed lot better. There is a reason why T-mobile is so cheap.Now i believe you can use wifi if you get no service back then they did not have that feature.Even if you are half an hour away from the city they have spotty signal.

I pay $110 a month with 2 lines w/ 2.5GB of data each and they let me upgrade every 2 year. ATT. Once ATT stop letting me upgrade every 2 year i am out.