Iphone 5 microphone problem?

I just got my brand new iphone 5 but whenever i wear a case no one can hear me.i've notice that when i facetime everyone can hear me but when i talk on the phone no one could hear me. So i made a video recording myself talking with the front camera and the back camera and whenever i used the back camera it was impossible to hear but once i turned the front camera on and recorded myself talking i could hear myself loud and perfectly. I know that there are 3 mics on the iphone so how could i set it so it could use the front camera mic at all times because whenever i make a phone call no one would be able to hear me. I guess my case is blocking the mic? But like i need a case on my phone because its a brand new phone and i do not want anything happening to it. I just want to set my phone so it could use the front mic at all times because that microphone is pretty loud and clear.

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