When someone dials your original phone number, here’s what happens:
Your mobile carrier forwards the call (via call forwarding settings) to a virtual number managed by KeepMyNumber.
The app, running on your device, receives the incoming call via VoIP (Voice over IP) over your internet connection.
You answer the call within the app — just like any regular phone call.
From the caller’s perspective, they’re just calling your usual number — no special dialing or apps needed.