I went to Mint Sim to cut costs. They use TMobile towers. 15 a month unlimited talk ,text, 2GB a month.To get 15 a month, you need to prepay for a year. I haven't had any problems. www.mintsim.com
Probably the best deal out there as of now!!
Very smart move doing mint sim, and its a legit company owned by ultra mobile which has been around for some time now.
Looks like they are currently offering the $15/mo for a three month trial also. Interesting it's that for 3 or 12 month accounts. The 6 month shows $18/mo.