It was very iffy until I dropped my pearl on hard ceramic flooring. Now the quality and clarity is great
Seriously though, I live in NJ and when I first got it I was pretty underwhelmed with the call quality. Even in areas where I had 4-5 bars, the quality of the calls was pretty bad. I switched from Verizon which I *never* had problems with so maybe I was just spoiled. However, for completely inexplicable reasons, ever since I dropped my Pearl, the call quality is easily on par with Verizon (aka pretty much flawless). Go figure!