@GR2
It costs £5 per month and you can set it up from the watch app on the phone.
Just follow the mobile data section.
https://www.o2.co.uk/help/device-and-sim-support/apple-watch
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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