I have an iPhone 4S with the very annoying echo!!

I have an iPhone 4S with the latest software from Apple. When I call somebody or if they call me the audio on their end echoes. What ever they say echoes back to them. This happens while using the normal mode WITHOUT a head set to listen. When I switch the phone to speaker mode the echo goes away. I did a reset (erase all content and settings)  as recommended by Apple and my cell phone service provider and this did not solve the problem. Just prior to this problem my microphone at the bottom of the phone failed and after replacement the echo started. What else should I check and is it possible the microphone at the top of the phone is picking up audio from the ear speaker causing the phone to resend what the person calling me is saying?

Hi there,
I would recommend taking a look at the troubleshooting steps found in the article below.
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
-Griff W.

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