Sony Xperia Z1’s using T-Mobile can expect to receive a notification for the system update Android 4.4.4 KitKat. Currently only available on certain handsets, including the Nexus 5, the update will bring several changes to the handset, including both in appearance and functionality.
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The update will bring the build number up to 14.4.B.0.37 and will now offer compatibility with Sony’s Smartband SWR10 and increased functionality with their Lifelog app. Aesthetic adjustments include a transparent navigation bar, changes to the quick settings and status bar as well as new animations and themes.
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To check your eligibility, navigate to Settings > About phone > Software updates > System updates.
Some people have reported a message saying the update was available, but that they need to connect their Xperia Z1 to a computer. If it suggests this, the update will need to be done manually by flashing the firmware file.
If you’re not on T-Mobile and want to know when to expect your update, you’ll need to speak to your network carrier.
Source: XperiaBlog