Could you give us more information please? Do you want to update or upgrade your phone...?
This is a community forum so you may need to speak to customer services
https://www.o2.co.uk/contactus
Yes we need a few more clues please @Farok
Hello @Farok, as it's been a while since you posted I just wanted to check if you ended up finding the information you were after in the end? It wasn't very clear from your post what you needed, however we do have a how-to guide on upgrading your phone in case that's still helpful for you, see here. 
Don't hesitate to pop back in if you need further help!
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