Sony-Ericsson has begun rolling out Android 2.1 updates on its Xperia X10, X10 mini and X10 mini pro mobile phones, starting with the Nordic markets.

The upgrade from the Xperia's existing Android 1.6 will occur in phases, according to a company blog post.

"[There] will be more kits coming already during Monday and then the roll-out will continue throughout the month of November," the company said.

In most markets X10 users will receive a push notification when the update is ready for download, the entry said.

Owners of the X10 model will likely see the biggest changes to their user experiences, like HD video recording with continuous auto-focus, richer backup and restore applications, a social phonebook that syncs content from Facebook and five different homescreens for your apps, widgets, shortcuts and folders.

X10 mini and X10 mini pro owners should experience better Bluetooth functionality, improvements in how your phone handles content in your text messages, new backup and restore functions and the social phonebook option that syncs with your Facebook content.

The Xperia X10 series was launched in U.S. markets in August through AT&T. For more details, see PCMag's full review of the Xperia X10.