My iPhone 4s won't play music or sound from videos without headphones in?

Okay, so I was talking to my friend on Facetime and she had to go. So I was then going to listen to music without headphones and i tried and the sound bar didn't come up, and when i pressed play nothing happened, I mean, it said it was playing but there was no sound. And i check the videos, same. So just for testing purposes, I had my dad call me, and the speaker worked, ring worked, vibrating worked, and just talking and the mic worked.

I just really need help and I'm really desperate for an answer.

It's most likely on mute (the side switch above the plus and minus signs)

I would just go fix it. I have a friend with the same issue.

My iphone is doing the exact same thing. Just started in the last hour.found a few other feeds that tell you quick fixes but nothing seems to work. Just updated to the latest ios a few minutes ago to see if that fixed anything and still no luck.going to fiddle around with it some more and see what I can find out.

Same thing happened to my iphone 4s a month ago, and I've tried everything I could but failed to fix it!