on 12-12-2018 10:36
Check the network status here http://status.o2.co.uk/
and check your account is paid an no outstanding bills.
Business customer services can be reached by the following methods http://www.o2.co.uk/contactus but try 8002 from your phone to see if that works first.
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone7 (EE)
on 13-12-2018 10:36