Hoping someone can help as I’m being driven demented by this issue no one seems to be able to solve. I’ve rung O2 about 4 times now with no one able to fix the problem. My iPhone XS Max will not connect to my watch properly so the cellular airtime plan won’t work. Everything else works fine but it simply won’t recognise that my watch has a data plan. The watch says I don’t have one, my watch app asks me to set one up then gives me error code 30 when I try, yet I’m paying the £5 a month for an airtime plan. I’ve had the watch since March with no solution to the issue. I’m at the point of complaining. I just want a watch that works how it should. Anyone else encountered this problem? I bought this to upgrade my series 4 that my daughter is now successfully using on her iPhone 7 Plus. I had no issue using it in my iPhone XS Max either. On my o2 app it’s showing that the series 4 is attached to mine and the 5 is attached to hers. It’s not! It’s the other way round.