[Q] not ring with leather pouch

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http://forum.xda-developers.com – Hello, I have a little problem with my htc sensation, when I put it in a protective pouch leather it does'nt ring and volume keys emit no sound too, but I hear and they hear me very well with the phone, and when I leave it without the cover or I put in a shock-resistant silicone everything works without problem Do you think that this is a hardware problem or is it simpler than that? thank you (HowTos)