My phone quality is awesome, on LTE, with HD it's crisp and clear...a little to good actually cuz I get in trouble all the time for key or controller button mashing the wife can hear on the other end!! Wifi enabled calls are just as clear, and I have had no issue with using the speaker phone...Pixel 3 XL. I had to show my wife that with her XL to hold the phone properly, because it is a larger phone she was holding the mic closer to her mouth, meaning the ear speaker was to high and she had been complaining about muffled quality, all good now though!!