O2

I currently have the s20 ultra and want to upgrade via o2 refresh with my s20, it says I can get an extra £150 if I preorder the s21, I can get £306 for my s20 for a total of £456, what I'm wondering is how exactly does the o2 refresh work with a pre...

I currently have a Samsung galaxy s20 ultra on contract, I would like to add an apple watch to my account and gift it to my girlfriend, i cant figure out how to do this if im even able toThanks in advance