Bluetooth sure. It was already using modulated audio like a modem over the analog jack. You can pair using bluetooth and continue to speak audio, with maybe low

Bluetooth sure. It was already using modulated audio like a modem over the analog jack. You can pair using bluetooth and continue to speak audio, with maybe lowered bandwidth to robustly survive the subband codec -- the mandatory base codec. But I don't know what kinds of OS-level permissions go into allowing apps to pair with bluetooth devices on iOS.