Iphone 4s volume buttons aren't working?

Okay, so i just went to the apple store to get my phone fixed because the lock button wasn't working, so they gave me another iphone. I restored all my pictures and music and when i was testing it out to make sure everything is okay, the music volume is gone, it seems like it only works when i put my headphones on and thats when the music volume appears. Also when i'm in the home screen, when i press the volume buttons in the side, it won't work.plus i showed my dad and he said i was right. Is there anything i can do? I'm beginning to believe that these are just refurbished iphones ---

Added (1). The voice limit is OFF

Make sure ( volume limit) is off
Sorry if this doesn't work

I had this problem with my old 3GS all I did was made sure volume limit was off. The silent slider was off and the when they didn't work I did a full restore and started fresh.

If you restored from a backup this is generally a large problem and as such it is always advised to start the phone from fresh and not a restore of a backup.

Should have tested all of this before hand to make sure it was working properly before filling it up with things haha.

It takes no time at all to re sync all the photos and what not so try that.

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