@Craig2618
Easiest way is to upgrade in your MyO2 http://www.o2.co.uk/myo2
You can also pop in store or call customer service Guide: Coronavirus Community Help and Support
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)