The iOS transfer process uses the same technology as AirDrop, what Apple calls Multipeer Connectivity: https://developer.apple.com/documentation/multipeerconnec

The iOS transfer process uses the same technology as AirDrop, what Apple calls Multipeer Connectivity: https://developer.apple.com/documentation/multipeerconnectivity https://developer.apple.com/documentation/multipeerconnectiv... The phones create their own ad-hoc Wi-Fi network, similar to Wi-Fi Direct.