Verizon, one of the top carriers in the US, is introducing new pricing options for its prepaid phone plans. Starting June 6, you can get 3GB for $40, 7GB for $50 or 10GB for $60 a month. Unused data can be rolled over to the next month.
In addition, Verizon still offers an $80 prepaid plan with unlimited data and you can get $100 (credited back from your bill) if you activate a new line.
Keep in mind, however, that similar to its competitor AT&T, Verizon will throttle video streams to 480p. And after you use all your high-speed data, you'll be slowed down to 128kbps until the cycle resets.