One of the gifts of technology is WiFi calling. WiFi calling is a technology similar to phone calls through which we can communicate with each other by making phone calls. But it does not require any SIM card. It is all done over WiFi.
Oppo A97 has several new and updated features and an improved Android version. In addition to these features, the phone comes with a WiFi calling system through which you can make calls without a SIM card. To know more about the phone, you can visit our website.