I updated OTA last week, but it didn't fix my problems. I then reflashed over USB to the global version instead of the USA version, still didn't fix it and now 90% of the time I try to make a call, I only get "General Error". I can still text and receive phone calls though... I'm going to try to reflash both the eMMC and the firmware again tonight, this time with the USA version. If this still doesn't work, I'm just going to chalk it up to a hardware issue and try seeing if Nokia can do something about it. :\