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原帖由: jtalbin ,

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DISCOVERY:  It is actually a defective headphone jack and not the microphone.  I got the idea from another post.   After a couple of tests to confirm behavior, I cut the end off an old cable and plugged only the dead/dummy end into the phone.  The phone now works like normal for both regular and speakerphone calls.  I can only guess that the phone's input jack has somehow become damaged.    Unfortunate that for now I have to have this tip/end/blank plugged into the phone but it works.

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