WiFi calling system is another way of making phone calls where we can keep in touch with others through a WiFi connection without a SIM card without using any app. This advanced technology can also be used in your Samsung M33.
Samsung Galaxy M33 Wifi Calling
Samsung M33 comes with Dual SIM functionality, and also, you can use a WiFi calling system where you can make phone calls through WiFi, but before doing this, you must enable the WiFi calling system from phone settings.