I tried two different pay as you go sims. Both Vodaphone and EE PAYG sims work (Calls & data) on the fairphone, two different EE contract sims do not work with data in the Fairphone but work with calls. The same contract sims works in a different phones with data and calls . It’s not a Linage issue its a contract network provider issue and it’s preventing data getting to the phone. I believe EE are actively preventing this to discourage normal users choosing less invasive OS, this is done automatically without permission by the network by checking for particular traditional signifying outgoing API’s, if they don’t find them your phone gets the silent treatment. The issue has been raised to 3rd tier support. They don’t have a clue or are playing dumb, tbh I’m not sure. I will be running wireshark over the next few days and post my findings here.
UPDATE >>> Fixed they rang this morning to tell me my device had been blacklisted and it took 48 hours to appear. They removed me from the list hay hoo data is back.