Often many telecom operators are offering Wi-Fi calling to their users, which can help make calling even without a network. Android and iOS operating mobiles have this inbuilt feature. 

iPhone users will be able to make Wi-Fi calling as follows:-
iPhone users will first have to go to the phone's settings and then click check Wi-Fi calling. Here you have to turn on WiFi calling. Then, you have to press the back button and go to the back screen. There you have to click on 'Other Devices'. After that you have to turn on this feature only for another mobile.

How to do Wifi Calling on Android phone:-
Android users must first check the setting network and internet and then wifi calling. You have to follow the guideline given by your telecom operator. You can then activate WiFi calling on your smartphone.

Take special care of this:-
As soon as this feature is enabled, you can call without any network. For this, only your phone should be connected to Wi-Fi. At the same time, check whether your network provider is supporting WiFi. You can also get the idea by discuss it with customer care.

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