Ive got a $30 prepaid plan with 500mb data. What happens if I use 1Gb data? Additional charge? Or no charge, but useage over 500mb is at 3G?
Once you use your plan data, and any rollover, you data slows to a maximum of 128 kbps which is 2G. (See # 10)
https://www.verizonwireless.com/support/prepaid-plans-and-service-faqs/