Then it does not matter what sim is in the phone as the update will come from Sony (no network intervention). Updates are usually rolled out in batches so the "up to date" message is probably correct at the moment for your phones serial number, but you should be getting it soon.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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