How does MetroPCS enforce their 1GB limit to data in their $30 unlimited data,voice and text plan?
Full speeds up to monthly allotment; then slowed for the rest of the billing cycle
As it says here https://www.metropcs.com/cell-plans.html,
That typically means slowed to 2G speeds, which may be ok for sending and receiving basic emails (without attachments) but useless for anything else, including most web browsing.