Mine was the same. Read somewhere that apparently it's a bug and a reset sorts it out. Tried it on mine and it made it much louder.
To do a reset hold the digital dial and the button down together till the phone restarts.
Worked for me so worth trying if anyone else is having this problem.
To do a reset hold the digital dial and the button down together till the phone restarts.
Worked for me so worth trying if anyone else is having this problem.