Sound on my iPhone not working properly?

I have an iPhone 4s and the sound will work when I get a call or a message but it won't work when I try to watch snapchats or vine videos? I can listen to them with headphones in but it won't work without headphones, does anyone know how to fix this?

Great p;hone

This should be the issue of the phone itself. Yes, its working with calls and messages but not in videos. Maybe there are two possibilities. The phone is not working properly because it can't play those vine videos or your phone is defective. Better take a visit to repair shop before anything worse would happen.

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