Well well my exact problem.
I dropped the phone, while i could hear others in normal mode I had some very loud noises during loud speaker call and people could not hear me in either times.
I sent it to a repair store!
It came up that the new introduced Mike in iPhone 4 was the problem.
They soldered it back and it was fine. Later on I find that my Wireless is reception very Poor (I have not tested GPS).
I think the repair store as probably you have left the G.P.S./WI-FI/Bluetooth antenna unscrewed or some connector to it.
I have been very wary to send it again as I doubt on the service(the did smth like this once).
I will send again but would need an opinion of what is missing first!!
Any body to help us is welcome!!
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I just accidentally found something weird. When I press my finger on the top right corner of the phone (screen facing me) and held it down tightly, my wifi actually started to become stronger. However after releasing, it went back to being weak. I tested this several times to make sure and it actually worked like that. I'm thinking it has something to do with the wifi frame touching the screen or motherboard. However, as Armald Imeraj said, any help is welcome!!
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