29-03-2020 14:43 - edited 29-03-2020 14:45
You need to speak to the Payment Management Team on 0800 902 0217. It's a free call. Also take a look at this link: https://www.o2.co.uk/help/account-and-billing/payment-support
If it's a dire emergency, you could buy a cheap payg phone and sim from Tesco.
on 29-03-2020 14:44
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)