Yes — and that’s exactly what it’s designed for.
Once call forwarding is set up from your original number to KeepMyNumber, your SIM card can be:
Removed
Replaced with a local SIM
Or stored safely
The app operates entirely through internet, so as long as you’re online, your location or SIM status doesn’t matter.
This is perfect for travelers who want to use a local SIM for data while remaining reachable on their home number.