on 03-09-2019 10:38
A slightly belated update - I got this sorted in the end. It turns out I’d been given a STAC code instead of a PAC code, which meant the old service with BT mobile stopped at the point O2 initiated my account, but without transferring the number. Luckily BT were able to partially reinstate my number to generate a PAC code, so I got my old number back after a few days.
on 03-09-2019 21:01
So glad you got this sorted in the end