Xperia S owners can now upgrade to Android 4.0 Ice Cream Sandwich, introducing various new features including an improved lock screen, resizable widgets, controls for mobile data consumption and a better overview of applications.
The update is directly accessible from the Xperia S over a mobile network or WiFi. Users can also connect to a computer to access the upgrade either via Sony's web-based Xperia Update, PC Companion or Bridge for Mac.
All Xperia S users will get a notification that the upgrade is available, although exactly when may depend on the approval process of their mobile carrier.
Sony said in a blog post: "The rollout will continue over the next few weeks and as usual, we will continue to keep you up-to-date with our progress, handling as much of your feedback along the way as possible."
However, the company warned that the software update package is around 200MB, so users may want to use WiFi instead of draining their mobile data allowance.
Sony has also announced a 'new way to experience media' on the Xperia S via three new apps - Walkman, Album and Movies.
Walkman blends the Sony audio technology with social features, allowing people to discover what music their friends are enjoying and sharing. The app features full Facebook integration and album art, images and information supplied by Gracenote.
The Album app offers a new way to organise and browse photos and videos, including options for instant viewing, commenting and sharing of photos on Facebook and other online services.
Movies enables streamlined playback and viewing of movies in high quality audio and video, as well as offering a database of movie posters and information.