TCL MOVEAUDIO S108 User Manual page 18

During a call using the earbuds, I
can't hear the voice of the caller.
During a call using the earbuds,
others can't hear me speaking
over a call.
• Some smartphones receive calls with the phone instead
of the earbuds by default. You need to operate your
smartphone to switch the call to your earbuds.
• Increase the volume of your earbuds.
• Adjust the volume of your connected Bluetooth device.
• Check your smartphone to make sure the voice is going
through the earbuds.
• Speak close to your earbud.
15