If you have poor cell reception in your home or office, did you know you can make calls using your Wi-Fi?
iPhones have a feature called Wi-Fi Calling. When enabled, you can use your Wi-Fi to make and receive phone calls instead of using your cell service.
Wi-Fi Calling Requirements
How to Enable Wi-Fi Calling
Wi-Fi Calling is disabled by default, so you'll need to turn it on.
Anytime you connect to a good Wi-Fi signal, your phone will automatically connect to Wi-Fi calling. You can double check this by looking at the top left of your screen. If you're connected to Wi-Fi calling, you will see AT&T Wi-Fi, Sprint Wi-Fi, T-Mobile Wi-Fi or Verizon Wi-Fi.
Fixing Problems with Wi-Fi Calling