T-Mobile has new Connect prepaid plans that offer unlimited talk and text with 2GB of high-speed smartphone data for $15 per month or with 5GB of high-speed data for $25 per month. They have also pledged to upgrade the allotment of data by 500MB every year for five years from the launch of this plan.
A&TT Wireless is also offering a similar prepaid plan that includes unlimited talk and text with 2GB high-speed data for $15 per month for a limited time. They also have a limited-time prepaid plan that offers 8GB of high-speed data with unlimited talk and text for $25 per month but you are required to pay for a year upfront ($300).