Same thing here. Excellent phone for everything except phone calls!!!
It's pretty weird that today you can make almost everything with a phone except the most basic thing.
And I'm not talking only about this proximity sensor bug (which is really annoying) but also about the lack of a dedicated physical button to pick up the call or to hang up. Many times you are talking and if you change the main screen by mistake you end up with an endless call (cannot easily return to the screen where you can hang up).
I also vote for some update to remove those 4 corners during a phone call. The proximity sensor works fine during service tests, but when walking it's almost always working wrong. I guess there's a design flaw related to the position of the two proximity sensors (yeah, it seems to have two), both located near the "S" from the Sony label. The "S" just goes to the middle of the ear when approaching the face, and probably the ear canal is providing that empty space needed from the proximity sensor to release the lock (just guessing a reason for the malfunctioning). So probably it depends much on the different "types" of user ears...
What is really silly is that having two proximity sensors (described in the manual) they put both in the same place (?!?).
Please update the software at least to minimize the problems that you introduced in the hardware.
Diego.
