Go to MY O2
http://www.o2.co.uk/myo2Click on "View latest bill" then on next page scroll down and click on "View and print older bills".
Choose the month you want to view from the next page then click on "what I've used".
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:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)