on 16-12-2018 19:01
16-12-2018 19:04 - edited 16-12-2018 19:07
16-12-2018 19:04 - edited 16-12-2018 19:07
Is your phone unlocked ? https://community.o2.co.uk/t5/How-to-Guides/Unlocking-an-O2-phone-to-use-a-different-SIM-card/ba-p/1...
If so, it may be the PUK for your other sim that's required?
on 16-12-2018 19:10
on 16-12-2018 19:10
The PUK won't unlock the phone to put in a different sim card which is why the code isn't working.