How do I change the device details on my O2 account?

[Alan-in-Hemel]

I bought my wife a new iPhone and swapped the O2 SIM over from her old iPhone and transferred the settings across using the Apple smart set up. Everything works fine. I did not purchase the new phone from O2 as I could get it £70 cheaper elsewhere. However I cannot find a way of changing the device details on her O2 account. How is this done?

[gmarkj]

You don't.
The system will update in a few days, but if it has not then you will need to contact customer services.
There is lots of advice on how to do that in the current climate on the link below:
https://community.o2.co.uk/t5/Other-Products-and-Services/Coronavirus-Covid-19-Community-Help-and-Su...

[Alan-in-Hemel]

I am having trouble contacting customer services. Does it actually matter that the incorrect details are shown in My O2? Are here any downsides to this? if not then I will wait until things improve to sort it out.

[MI5]

@Alan-in-Hemel 

The only time it would make a difference is if you were trying to get wifi clling to work and the phone shown in your MyO2 was not compatible, but in general, it makes no difference at all.