: If you renew your plan on time, unused add-on data may roll over to the next period. How to add it : Online : Sign in to myPrepaid and navigate to Add-Ons .
If you are on an AT&T monthly plan, you can add high-speed data for your mobile hotspot or switch to a plan with more "priority data." how to buy more data at&t
Prices and data allotments are based on AT&T's latest Unlimited Data Plans and Prepaid Data Plans. Manage Data Only Plan - AT&T Wireless Customer Support : If you renew your plan on time,