Apparently, it still isn't fixed on the Sony Xperia Z3 compact. Just bought a new one (April 2017) and the sound is garbled on the other end. Sounds like someone with a mouth full of marbles in a fish tank. Tried all of the fixes software update, factory reset (twice), and different sim. I like the phone because it is small and the battery life is the best. However, I'll probably get an old I-phone or a Samsung 5 mini. I'm returning this one, but I don't dare get another Sony. This seems to be an ongoing issue with their Phones, based on my internet inquiries.
