it didn't help. Maybe I should mention that the phone is already opened. Is there any antenna in the backcover so the phone cant get the provider information and reception? the sim slot seemed to be ok because every pin in the cable had contact to a sim pin.
There is no microphone on the "frame" of the Iphone 3g. The microphone sits in the dock connector part. Maybe you are talking about the earpiece? Yes, you have to remove the earpiece, mesh, proximity sensor and homebutton and add it to the new assembly.