I had the same problem I got the Aplha Glass screen protector with my Otter Defender case and I followed the instructions closely. I couldn't hardly hear anyone on the other side. Found out the screen protector was covering the speaker. So I took it off and it solved the problem. Naturally it runied the new screen protector. Pathic design. The screen protector is too long if you don't want to cover the Irs Scanner at the top of your phone too.
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