Apple mobile phone video recording can be used with Bluetooth headphones, and there is no problem with Bluetooth headphones as MIC. Now the Apple mobile phone is also very powerful, when recording video, you can use a Bluetooth headset as a mic, the effect is also good. It is mainly used as a close-up mode.
Some mobile phones can not use Bluetooth headphones when recording, each brand of mobile phone features are different.
The iPhone can record the screen using a Bluetooth headset, but sometimes there may be no sound when you record the screen using a Bluetooth headset