IPhone 4 speakers don't work?

So, I bought a new iPhone.
Immediately I realized that the speakers for it do not work.
The phone is NOT in silent mode, I've tried blowing in the speaker and headphone jack.
The sound works fine when I'm calling someone.
It doesn't think it's in headphone mode.

I'm so confused.
Any suggestions?

Well I have a iPhone 5GF (5th generation future) version 7.2.1 I don't know if it will work the same but hold the main button a box will come up it will say state your problem all you do is say (fix volume, set high) and it should work I had same problem hope it helps!

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