Developing Fast': Britain Facing...
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No best answer has yet been selected by brummie. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.I think mine's like this. There are two buttons on the left hand side on the outside that get pressed inadvertantly. You either get mystery bleeps in your pocket or it switches to silent or vibrate. If yours has these buttons you push the lower one to cycle through the options and then the upper one to set your choice.
I find it very annoying.