IPhone Gone Crazy! What to do?

I have an iPhone 4S. I bought it from Thailand this Summer (April-May).It's authentic and everything.

I jail broke it about 3 moths ago, and until now it was working just fine.

Suddenly, a few days ago, people stopped calling and texting me. I felt so "forever alone" (haha).
But then, a friend called me on another phone and said he'd called a million times, but no one received. When I checked my phone, it had nothing. While someone was calling, my phone wouldn't even light up. On their end, it would ring, but my phone wouldn't have anything - no missed call, no sing of calls.

I don't want to restore my phone, because I can't back up a LOT of stuff on my phone, so can you guys please help me?

Did you turn on do not disturb by mistake? Its in settings in ios6

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