Speakers on iphone don't work?

Alright, so a few weeks ago I had the glass on my iphone 4 replaced. I don't have insurance on it, so that was the cheapest way to get it fixed. Well since then, the speakers on the phone don't work. I have tried reinstalling the software but that didn't fix anything. Now there may be a wiring issue that occurred when the glass was replaced but the company would need the phone over night to fix it and I don't have time for that. So if anyone has some advice that would be great!

What works/what doesn't:
-Phone calls work, the person can here me/i can hear them.
- speaker phone does NOT work. I hear nothing, other person can still here me.
- Phone doesn't ring or play music.
- One app (Zippo app) works just fine, I can hear all the sound effects normally when I turn it on.
- If I'm in a call and go to text someone, the sound works… I hear the key clicks and it beeps when I get a new message (again, ONLY if I'm currently on the phone with someone)
Everything works normally if I put headphones in…

Your phones speaker is blown.

Maybe try resetting the whole phone? It doesn't sound like your speakers are blown, since then it would never work, whereas you said it worked for one ap

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