Phone Does not ring when its in my pocket

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http://forums.androidcentral.com – Today 3 calls went to voice mail. I heard the notice that there was a new voicemail, but never hear the ring. I called from a land line and it didnt ring, but once I pulled it out of my pocket it started to ring. I always thought that this was due to something else, but I got 3 calls at home in a row, no ring. Is there something I need to change? Thank you. (HowTos)