25-04-2020 15:58
25-04-2020 16:13 - edited 25-04-2020 16:16
25-04-2020 16:13 - edited 25-04-2020 16:16
Official line is here, https://www.o2.co.uk/help/safety-and-security/age-restricted-content-and-age-verification
If you have home WiFi, the age restriction of that provider, not O2's, applies, @LJG.
You could try calling on one of the numbers below and see if there is a new method in these changed times if using your O2 data is your only means of accessing the Internet:
Guide: Coronavirus Community Help and Support
Good luck!