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As with everything update related we simply don't know and as such direct you to Sony care here http://www.sonymobile.com/global-en/support/contact-us/ to ask these questions - What I can tell you is in the UK Networks have to aproove the update before it's released to Generic handsets
@TWINBORO wrote:
Thanks for your reply Thommo.
Who releases updates to Generic Xperia sp
Sony do, but it seems they agree when with the network providers. I think (but I don't know) it has something to do with the 4G rollout, which is still ongoing.
Orange, EE and T-mobile have already got the update, so I shouldn't think you'll have long to wait.