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Help Speaker phone turns itself ON, for every call

I just had this problem crop up on my m8 and it just started today as I clearly remember using my phone yesterday and speakerphone was not coming on by itself. I hadn't touched any settings or installed any apps since but I was reminded of a time when I got a drop of water in the USB port of my s2 and it activated car mode and wouldn't turn off until I got it completely dry.
Long story short, I cleaned out the USB port AND headphone jack on my m8 and the problem instantly stopped. Hope this helps.
 
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These are all older posts, but.....I had to factory reset my phone and now it is doing answering/calling on speaker. I got it turned off and hopefully it is a permanent fix.
1. Go to settings.
2. Up at the top I typed in the word Call.
3. Under language and input, I unchecked the Calls from favorite
contacts box.
That's it! Working perfectly ;-)
 
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For the last couple of days my Samsung Galaxy Note-3 phone was also behaving this way. After failing to diagnose the problem, I resorted to this forum and tried many of the tricks shared here. After several tries the Battery-Removal technique worked for me. I was wondering why didn't I already try this technique, since, this happened to be the One-Size-Fits-All solution.
 
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I recently had this problem occur on Galaxy S8. Very annoying but in case anyone has experienced this happening, I found the real solution.
Settings-->Advanced Calling-->Advanced Calling needs to be turned off. It turns on/off HD voice calling which leads to speakerphone always coming on when making/receiving phone calls. The latest update may have triggered it to being switched on.
 
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