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Apple Watch Not Working After Upgrade

Level 1: Joiner
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Hi there, I have just upgraded my phone and a new sim has been given. I don’t seem to be able to make calls on my Apple Watch cellular version now. It will when phone is switched on but not working when the watch is on its own. I don’t think the esim in the Watch is now linked? How do I get someone to look into it? Or is there a certain amount of time after upgrade for systems to catch up?
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Level 94: Supreme
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Easiest way would be to call customer service to check if your account needs to be reset for the watch to work.

Numbers here Guide: Coronavirus Community Help and Support 
Or advice from an O2 Guru regarding a way to get through:
If you call 202, when it comes to the reason you are calling stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
Say "Upgrade", "Lost/Stolen" or "Fraud" if you have to, to get put through to someone.

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.

Currently using:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
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