Apple is offering the WiFi Calling with more carriers supporting it. https://support.apple.com/en-ca/HT203032 This is wonderful. However, iPhones are designed to turn off wifi during standby (sleep) to conserve battery. This is not a problem when making a call, because wifi will reconnect as soon as you unlock the screen. But... How is the phone supposed to receive calls when it disconnects from wifi, and have no cellular signals (the whole point of needing WiFi Calling in the first place)? Am I missing something here?