How do I register my phone after upgrade?

[Anonymous]

How do I register new phone to the network after upgrade

[jonsie]

Merely putting in an active sim card will register it on the network. 

Have you received a new sim? 

You will need to do a sim swap here: http://swapmysim.o2.co.uk

[Marjo]

Good evening @Anonymous! Let us know if the above worked for you or if you experience any issues with it?

And welcome to our forum!

Thanks @jonsie for your help!

[Anonymous]

The sim will be inactive if you received the upgrade via online or over the phone.

if you upgraded in store then they will have activated the sim when they put it in the phone 

[MI5 · Accepted solution]

You can just continue to use your old sim if it's the same size and you have upgraded on o2.