Bluetooth headsets will work for audio only in SnapMobile WebPhone.
Call buttons (answer, hang up, mute) require a USB-connected headset.
Bluetooth headsets — even when using a USB Bluetooth adapter — do not support WebHID call controls.
To use headset buttons, you must use:
- A USB headset, or
- A wireless headset with a manufacturer USB dongle
This is a browser limitation and expected behavior.