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And do you know how could i fix this issue? I've tried a lot of things and none work.I just checked my phone, and I have S voice set up and it starts when I turn on my phone, so I can use my headsets and place calls. I had my headset on and placed a call with S voice and that icon never showed up on my phone, so I think it's not for S voice.
My search tells me it means your speaker phone is in use...