If you’re using the T-Mobile variant of the slick Sony Xperia Z, check your notification tray – you might have a very welcome waiting for you. According to this T-Mobile support page, the Xperia Z is finally getting an over-the-air update. It’s probably not what you were hoping for: the update brings the phone up to Android 4.2. You know, the version that’s now over a year old. If it makes you feel any better, it’s been only five months since the Android 4.2 update was sent to the international version of the Xperia Z. (I guess that probably doesn’t make anyone feel better.) Sony had announced its intention to update the Xperia Z, among other