Sony Mobile has started rolling out a new software update for Xperia P, Xperia U, Xperia go and Xperia sola that brings bug fixes and performance tweaks.

The Ice Cream Sandwich firmware includes improvements to stability, WiFi, tethering/portable hotspot, camera (capture and playback), NFC and Messaging.

All Xperia P users will get a notification when the upgrade is ready, but direct availability in the phone may vary across different markets and carriers.

For Xperia U, Xperia go and Xperia sola users - if you've already upgraded to ICS, you'll receive a notification in your phone and be able to download it over-the-air. For those guys on Gingerbread, you?ll need to plug in and upgrade using PC Companion or Bridge for Mac.