Android 4.3 finally arriving on T-Mobile Xperia Z

Though the international variant of the Sony Xperia Z was recently upgraded to Android 4.4.2 KitKat, those in the U.S. aren't as fortunate as T-Mobile has only finally gotten around to updating the waterproof handset to Android 4.3 Jelly Bean. T-Mobile customers should begin getting their update notifications now. This brings the firmware build to 10.4.C.0.814 for the Xperia Z on T-Mobile.

source: androidcentral