How much data do I need for a trip to Peru?

For a one-week Peru trip with maps, WhatsApp, photo uploads, and Uber, 3 GB to 5 GB is enough for most travelers; 10 GB covers a 10–14 day trip with regular Instagram posting. Heavy users — long bus rides through the Andes, video calls home, streaming on the night bus from Cusco to Arequipa — should pick 20 GB or unlimited. Bus Wi-Fi in Peru is unreliable, so plan to tether from your phone on overland legs, which uses more data than expected.