Cannot make a phone call
Cannot make a phone call.
Some smartphones and phone apps do not support hands-free calls.
Cannot hear the caller’s voice.
When there is an incoming call, tap the touch sensor on the right or left earbud to answer the call.
Check that the power of the Bluetooth device is on and the Bluetooth function is enabled.
Select HSP or HFP as the Bluetooth connection profile on the transmitting Bluetooth device. For details, see the Owner’s Manual of the Bluetooth device.
Check that the Bluetooth device is set to handle calls through the earbuds. For details, see the Owner’s Manual of the Bluetooth device.
Increase the incoming call volume.
Disconnect the earbuds from the Bluetooth device, then reconnect.
Your voice cannot be heard by the other party.
If the built-in mic function is off (mute), your voice is muted. Turn on the mic function. link