| | Re: defective z10
The speaker on the Z10 is on the bottom. cover it and you will hear less. It is the location sound comes from when the phone is in a holder. The ear speaker that is on the top front is inactive near the magnet in the case.
My best guess because you did not give the make of the case your using.
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9810 BES Z10 on BES 9700 BIS