Using 2 100gb data cards in one month

Hello @Thatsmrpigg, we'd be happy to answer your questions regarding adding extra data to your AT&T prepaid plan. 

Be advised, if your plan has an add-on feature for data you'll be able to add extra GB for a certain amount without purchasing an extra plan.

• Get 100GB of wireless internet per bill period. After 100GB, more data is automatically added in increments of 10GB for $25.

Give your plan a review, and let us know if you have any further questions or concerns. 

Thanks for contacting the AT&T Community.

Lynn, AT&T Community Specialist

Rather than buying data add-ons, you can force your 100GB plan to renew by going through the change plan process. When you change your plan, even if you pick the same plan, your old plan terminates. The new plan starts as soon as it is paid for.