Those in the UK have been waiting patiently for the latest version of Android to arrive and it is now available for unlocked devices, according to users on the Android Central forum. It's been just over four months since the Nexus 5 was launched, introducing Android 4.4 KitKat.
See also: Samsung Galaxy S5 hands-on review.
The firmware update is reportedly between 300- and 400MB in size and takes both the Galaxy S4 and Galaxy Note 3 to version 4.4.2 of KitKat. The new software changes the notifications bar icons to white among other things.
Users aren't reporting much difference with the new software but there are some bits and pieces which aren't so obvious straight away. KitKat adds features like a full-screen immersive mode for some apps, lockscreen album art and cloud printing.
Other behind the scenes tweaks such as memory optimisation improves overall performance and that seems to be the case from users who have upgraded their devices. One user said: "battery seems better to me.. I normally lose 809% overnight but it dropped just 5%".
If you're not getting a notification for the KitKat update, then check manually in the settings of your phone or try Samsung's Kies desktop software. Software updates don't roll out in one big go so be patient if you haven't received the update yet. See also: How to manually update an Android smartphone or tablet.
Although KitKat launched with the Nexus 5 last year, the software has only made its way onto 2.5 percent of devices. The most popular version of Android is 4.1 Jelly Bean which is on 35.3 percent of Android smartphones and tablets.