Rahul Soni 
When you can’t get a mobile signal, you can still make calls and receive texts on your iPhone.
With WiFi calling, your calls and texts are routed through whatever WiFi network your iPhone is logged into instead of your carrier’s cellular network. That means you can still be reached in the subterranean levels of hospitals, coffee shop dead zones, and anywhere else with good WiFi that you can’t get a cellular signal.
How to activate WiFi calling on iPhone
- On your iPhone, go to Settings
> Cellular. - If your iPhone has Dual SIM, choose a line (below SIMs).
- Tap Wi-Fi Calling, then turn on Wi-Fi Calling on This iPhone.
- Enter or confirm your address for emergency services.
Note: Emergency calls on your iPhone are routed through cellular service when available. In the event that cellular service isn’t available, and you have enabled Wi-Fi Calling, emergency calls may be made over Wi-Fi, and your device’s location information may be used for emergency calls to aid response efforts, regardless of whether you enable Location Services. Some carriers may use the address you registered with the carrier when signing up for Wi-Fi Calling as your location. When connected to Wi-Fi calling, your iPhone may not receive emergency alerts.
When Wi-Fi Calling is available, “Wi-Fi” is displayed after your carrier name in the status bar, and all your calls go through Wi-Fi.
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