No sound on iPhone 4s including Bluetooth? Suggestions?

There's no sound at all even with wired and wireless headphones. There's also a crack next to the home button that might accumulated dust overtime.

Um well sometimes I have this problem with my 5s and even with my 5 before what usually helps would just reset or like turn it off and on in 5 minutes that always did the trick and I ACTUALY have a crack next to my button to like its touching but don't worry that's not a problem ands just sometimes the phone gets overheated and that should do it as long as you didn't drop in water if you did then that would be the problem but! So ya just turn it off and back on! Hope I helped