Roamless

Roamless offers a global eSIM service built on the RoamlessFlex framework, where any unused data automatically carries over to your next purchase instead of expiring at month-end. The service employs automatic server routing that helps bypass network restrictions like China's Great Firewall, so you stay connected even when local carriers implement geofencing.

Best for frequent travelers to China who hate the waste of monthly plans and need reliable access to services blocked by regional filters. The data rollover approach means you can buy what you need without padding your purchase to account for uncertainty.