crappy voice quality on an Android galaxy s5

I have for the past e 3 weeks niose on my phone feedback and bad quality of calls , what should i check?

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Test the call quality also with a strong and fast wifi signal, and then use Skype or Hangouts (with another user on a strong and fast signal too)
If the call quality is good or better, it means the electronics in the phone (microphone etc) are in good order, and your phone provider is causing the bad call quality.
If you find out the quality is still bad, then start using the headphone set that came with your SGS5, or otherwise a bluetooth headset that was proven to be of good quality beforehand. If NOW the call quality is good, it's probably the internal electronis of the SGS5 (which means, it has to be serviced under warranty).
If the quality is still bad (normal calls/voip or skype calls, normal phone, headset, bluetooth), it's quite weird, I think I covered almost all bases. Maybe you installed an app that does something to your phone, and a full reset may be needed (if you can figure out what's causing it, like a phonecall recorder, audio equalizer etc).

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