Some Sony phones are guaranteed to get the new OS, but a number of Xperias still face uncertain KitKat futures.
The Xperia Jelly Bean update begins today for Xperia T and Xperia V owners, while Xperia TX owners will see the update next month.
Sony has confirmed which handsets will be treated to the Android Jelly Bean update, but they'll have to wait until next year.
ExclusiveSony says smartphones are critical to its success and is a key way of driving consumers to its other products.
ExclusiveIf UK consumers and networks want the 4G Xperia V, Sony is more than happy to give it to them.