on 20-05-2020 15:41
You have to call customer service.
Select any option either being fraud or theft to get through.
Try the number ending with 4005 it work best
I read that you will have to fill out some forms when you call
on 20-05-2020 16:42
How to and claim form here https://www.o2.co.uk/help/digital-services/o2-insurance
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)