@ImoFollow the instructions below:
This is from
https://www.o2.co.uk/help/pay-monthly/o2-openIf you’re a state-funded teacher in the UK, then good news – you’re eligible for O2 Open. This includes if you work at a state-funded school, academy, free school, college or sixth form, but not at a higher education institution like a university. To add the discount, visit our O2 Open page and follow the instructions under ‘How to claim your O2 Open discount’. Your five-character O2 Open code is TEACH. When you’re asked to submit a copy of your payslip, you can either do this or you can choose to submit a copy of your ID badge, showing your name and the name of your employer, instead. Just follow the instructions in the My O2 Open portal to submit one of these.
This is not customer services and we dont have access to your account
I do not work for o2 or any VMo2 /Telefonica/Liberty Global Company