When using phone there is a hmmm that is tranmitting on the phone

iphone 5  with At&T   I hear a low buzzy noise when using the phone.  The person on the other end hear it too

Computer:
MacBook Pro 2009
Mac OS X 10.6.8
2.26GHz Intel Core 2 Duo
4 GB RAM
Still have over 80GB left...plenty. Thanks

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