Iphone 4 sound doesn't work?

My Iphone 4 was working just fine when I was listening to music, and then it just stopped. I pulled up my settings (iOS 7) and the little bar where you can adjust the volume was gone. So i tried clicking the two sound buttons on the side and the little volume square didn't even show up. Sometimes if I plug and unplug my headphones it will work (only with the headphones in) but sometimes it just randomly shuts off. I've shut down my phone multiple times, I've restarted it multiple times, and I just updated my phone to see if it would fix it, but it didn't

It's so weird. The sound will randomly disappear and reappear.

Try holding down the Power button and Home button. If that doesn't work, just call Apple.

I have a same problem.I'm watching best answer.

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