Why doesn't my iPhone 4S volume bar don't work?

Okay so I found out like three days ago that my volume doesn't work like once I try pressing on the + or - on the volume it just says ringer and it doesn't go high or low, it also doesn't work for like an app example vine or fun run, or music. I tried going to settings, general, reset, and reset all settings and its still not working.

Well, good questions. I'd send it in for a repair if you can't figure anything out in a week or so.

I have an iPod touch 4th Generation, that thing has happened to me too, I can't get up or down the volume by pressing the buttons or on music or on the multitasking bar (the one that appears when you double-click the home button) what I did was resetting my ipod (turning it off and on again), have you tried doing that?

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