Habe folgendes im netz gefunden. vielleicht kann das ja mal einer mit seinem e800 testen, denn ich bekomme meins erst morgen.
wenn das funzt, das wär ja mal was, oder? 
READ THE WHOLE THING FIRST
Main screen type *#8999*8378#
you will enter test mode
Go to H/W test(hardware test) 2
audio settings
RX Path
Melody Vol
When you press this you are in Level 1 immediately, change the number by c 'ing the existing number and put 0
Next press
save (save Level 1)
save (save Level 2 without changing anything)
save (save Level 3 without changing anything)
save (save Level 4 without changing anything)
save (save Level 5 without changing anything)
IMPORTANT
Only adjust first one. When you press save it goes to the next level saving any changes. So any changes you make are automatically saved BE CAREFUL and there are 5 levels...
go back to main screen, restart your phone
No sound for taking pictures