04-12-2019 11:09 - edited 04-12-2019 11:13
You would have to be on a Sharer tariff to do that https://www.o2.co.uk/sharer-plans
As you haven't set it up already, you need to speak to customer services Guide: How to find help & contact O2 or pop instore to see if it can be activated. Initially it would have been set up via My O2 http://www.o2.co.uk/myo2
on 04-12-2019 11:49
Right now, the only way is to enable your phone's hotspot so he can tether from you but he would have to be close by for this to work.
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)