how to use my mobile in costa rica

We understand the need to have a cellular connection while visiting Costa Rica @Gerd.

We offer a PREPAID international travel add-on to talk, text, and use data while in select countries. Enjoy 7 days of unlimited talk and text, plus 5GB of data in select countries for $35.

However, based on our PREPAID Coverage Map, Costa Rica is not a country we cover for this feature. We do offer Costa Rica for our Postpaid customers who add an International Day Pass to their wireless plan.

We hope this helps! Thank you for contacting AT&T Community Forums.

Samantha, AT&T Community Specialist

Bottom line, prepaid service does not work from Costa Rica and there is no international plan. If you have WiFi calling activated, that might work from Costa Rica.