on 07-10-2020 15:26
I don't use the phone very often, and it hasn't been topped up for quite a while. When I switched it on today it came up with the message 'SIM card registration failed'. What can I do about it?
on 07-10-2020 15:53
Your sim will have been disconnected as you need to send a text or make a call at least once every 6 months.
To reactivate it, you need to call o2 on any of these numbers Guide: Coronavirus Community Help and Support and they will do it for you.
If it has been too long out of use you may have to be given a new number but any credit should be reinstated within 24 hours.