It was the first Sony Ericsson smartphone to run the Android operating system, and was designed to be the successor of the Xperia X2.

The phone was shipped with Android 1.6 (Donut), but an upgrade to 2.1 (Eclair) was made available starting 31 October 2010, with a gradual international rollout.

[6] The UX platform features two applications which allow the user to consolidate all of their communications and media, Timescape and Mediascape, respectively.

[8][9] The display is a wide TFT Capacitive touchscreen,[10] with a 16:9 aspect ratio and FWVGA resolution of 480 x 854 pixels, along with a multi-touch enabled screen, the first from Sony.

Timescape is a program that brings together Facebook, Twitter, SMS, and email into a column on the home screen.

This makes it possible to attach photos users have taken with the camera to their contacts or send them directly to their Facebook account.

On 1 February 2011, Sony Ericsson announced a future update for Xperia X10 that would bring optimizations and bug fixes along with language additions and the pinch-to-zoom feature.

Since the Android 2.3 (Gingerbread) update the phone has suffered a stuttering in play or streaming of music regardless of file association.

[citation needed] Sony refuses to acknowledge the problem and have as of late offered no solution to this bug.

[citation needed] Sony Ericsson announced two mini versions of the Xperia X10 at the Mobile World Congress 2010.