Mute Service Sound

[Guest sebflipper]

Currently on my O2 XDA Mini S if you totally mute all sound or set it to vibrate, it will still play the service sound when you check your balance or get a service message like "You have used 1 minute credit today, after 2 minutes you will be put onto a lower priced talk plan" or what ever you get from O2 after making a call.

Is there any way of turning off or disabling the service sound (which is the default Notify sound) which still plays even though I have muted all the sound options? :)