Microphone not working on iphone

Microphone only works when on speaker phone.

Hi,
I had the same issue here. bottom microphone not working on my iPhone4. tested an dtried some different apps and came up with the following:
during voice call: bottom mic not working
during facetime: YES other side can hear me
memorecorder: YES sound is recorded
video: YES sound is recorded
I've searched around the web and the apple support pages, and found some simple options to be taken to resolve the issue:
1 clean out the 2nd (noise cancellation) microphone (which is the little pinhole right beside the earphone jack)
2 restart the device (eliminating virtually all software / app malfunctions)
3 reset network settings in settings menu (eliminating network issues)
4 full factory reset on iPhone4 (make sure to back it up properly before) (why should this be the resolution if the restart didn't do it before?).
5 open up the backside and insert a little piece of cardboard (about 160gr/m2) as per the attached video:
http://www.youtube.com/watch?v=0jhWxYTVxe4&feature=related
6 go to the apple store / make an appointment with the genius bar
neither 1, 2 nor 3 resolved my issue with the bottom mic during voice calls (I still could hear the other side, they could here nothing, or some static and crackling from my side). as gathered the 4th possiblity would not to make the difference (i got convinced this was more a hardware than software issue), i jumped to option 5.
AND IT WORKS NOW!!! yippieeeee (what would an iPHONE be if you can't call....)
all you need is a steady hand, good eyes and a ph00 or ph000 screwdriver.

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