on 03-02-2020 12:38
Old bills should still be accessible by following this Guide: How do I get to the 'Download Bill' page?
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
on 03-02-2020 16:11
Just as long as it isn't a while since you closed your account then it should still be accessible. Otherwise you need to request them from customer service.