I cannot make calls. Not registered on network

[Cappers]

I cannot make calls. IT comes up Not registered on network. What can I do.

[TallTrees]

Hello @Cappers 

Maybe these guides may help

Guide: How can I sort out my network issues? 

Guide: Is the network down for me or everyone? 

or it you need to contact o2 here:

If this helps and it works for you the
Social Media Teams will be on hand just
send them a message
https://o2uk.co/O2CFB
https://o2uk.co/O2CTW
https://o2uk.co/O2CIG
Facebook, Twitter and Instagram

[MI5]

@Cappers 

It sounds like a sim issue.

Try rebooting your phone, if that doesn't help, pop in to your local O2 store for a free sim replacement.

Take some ID with you too.

[RafaC]

Hey @Cappers were you able to sort this one out?