Why is the volume so low on my iphone?

My family jut got 3 new iphone 4's last night. When someone calls us or we call them, the volume is very low. It is like they are in a tunnel or something. I did turn the phone volume all the way up with the sidebars and the plastic is off of the phone. Any suggestions?

Strange! Ermm take it to where you got it from and ask if they can fix it & show them the problem…

Go to settings;sounds;volume scroll up to the top. If that doesn't work, go back to the place where you got it and ask for help.

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