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Upgraded phone and can't make or receive calls

Bug1
Level 1: Joiner
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Registered:

I've just upgraded to an iPhone11 and now can't make or receive calls.  The outgoing calls all show 'failed' and the incoming calls all get a voicemail recording.  What do I need to do to rectify this?

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MI5
Level 94: Supreme
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Registered:

@Bug1 

Are you using your old sim or did you do a sim swap if using a new one?

Guide: Sim Swap: a mini guide 2017 update 

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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