For cell connection search Google for "e.g. Telsta apn settings" in your phone under Settings search for "Access Point Names". Compare the two, if different VERY carefully note the Google result 100% correcctly Also note your phone settings in case you want to revert. Restart, noting you may lose phone settings. Check wi-fi calling. Note this feature won't work if cell settings are wrong. If this won't work after changing APN settings post again. Advise if you have a dual sim phone.
