SimSwitch

SimSwitch is a simple and practical tool for switching mobile data between two SIM cards.
It lets you quickly switch between your mainland and external SIM cards, and provides a floating window so you can change the active data SIM without repeatedly opening system settings.
Key features:
Quickly switch mobile data between two SIM cards
Support SIM slot mapping for mainland and external SIM cards
Check SIM, default data subscription, and Wi-Fi status
Floating window for quick switching
Shizuku-based authorization
Step-by-step setup guide for first-time users
Chinese and English interface
Optional links to RTK Survey and GIS platform services
How to use:
Grant overlay permission
Install and start Shizuku
Complete Pairing and Start in Shizuku
Grant SimSwitch Shizuku permission
Check the current SIM and Wi-Fi status
Start the floating window and switch mobile data quickly
Important notes:
SimSwitch requires Shizuku to perform system-level operations.
SIM and default data behavior may vary by device manufacturer and Android version.
Make sure both SIM cards are installed and available before switching.
SimSwitch does not modify APN, carrier plans, or operator settings.
Overlay permission is required for the floating window feature.