Overseas Data Options: Roaming, eSIM, USIM, WiFi

TL;DR

• Roaming: Use home carrier abroad—easy, expensive.
• eSIM: Buy data plan online, install before departure—good balance of cost and convenience; keep home number (dual SIM).
• Local USIM: Buy at destination—often cheapest for heavy/long use; may need to remove home SIM.
• Pocket WiFi: Rent one device, share—good for groups; pickup/return, battery, single point of failure.

See Roaming vs eSIM vs local USIM, eSIM vs Pocket WiFi. Compare eSIM plans.