If you see that your phones keypad is locked like here on the picture and don’t know why

grandstream_keypad_lock

 

then most probably haven’t locked the phone yourself or by accident.

The keypad is locked by continuously pressing the * (star) button for 5 seconds.

 

to unlock the phone please do the following:

press the * (star) button for 5 seconds until you see this menu appearing (picture)

grandstream_keypad_lock_pass

 

if you accidentally locked the phone there will be no password set so:

Press OK and the phone is unlocked