on 08-06-2020 11:54
on 08-06-2020 12:28
You need a refresh contract for an iPhone or a sim only from O2 attached to an iPhone.
on 08-06-2020 13:47
3 does not support Apple Watch see Apple link below
https://www.apple.com/uk/watch/cellular/
So if you want a watch you will need to take out an agreement with O2 and connect it to your Iphone on O2