@JWhileFull details are here, and can be done online:
https://www.o2.co.uk/help/device-and-sim-support/how-to-keep-your-mobile-numberIf you need to call o2 then follow the details below
You need to call 202 from your mobile.
If you call 202, when it comes to the reason you are calling, stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone
- Xperia 1V - o2 and Spusu
- Pixel 8 Pro - o2 and Vodafone UK