Hello there Hayleysmith and welcome to AF!
I am not sure about your issue as I do not have that phone.
However, there a many other members here that can help and perhaps look here: Samsung Galaxy S3 - Android Forums
My friends above gave you some good tips. Also, I'm not sure if it might be the same with your S3, but ICS has a problem on the S2 (at least the T-Mobile version) when calling sometimes there is a problem hearing or being heard. Hopefully you'll get Jelly Bean soon on your S3 and maybe that will help.
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