My iPhone 4S won't accept calls or texts when locked?

When my phone is locked, my phone doesn't ring, or make a noise when I get a text? But when I look on my phone it says I've got a missed call and I have a text. Also, when people try calling me, it says I'm unavailable, please help! It was working fine last week!

This could be that you have it on do not disturb mood if you have updated to the new software iOS6 this is something new on the software and it could be that check your settings scroll down and it should be there and simply turn it off

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