TCL 406i Manual page 27

During a call
To adjust the volume during a call, press the Volume up/down key.
End the current call.
Touch to mute the current call. Touch this icon again to unmute the
call.
Display the dial pad.
Touch to activate the speaker during the current call. Touch this icon
again to deactivate the speaker.
Make another call.
Switch to video call.
Put a call on hold.
To avoid accidental operation of the touchscreen during a call, the screen
will be locked automatically when you put the cellphone close to your ear;
and it will be unlocked when the cellphone is taken away from your ear.
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