O2 blueroom

Darren, thanks for your post.
If your phone is still not being recognised and you’re still having trouble registering, the best option is to contact O2 Support who will be able to help you - details of how to do so can be found at http://service.o2.co.uk/

heppened to me too. On a wild guess I entered the imei without the dashes and it let me register

I had similar problems. I contacted O2 and they said that the IMEI number should be one continous number. Another thing is that if your Cocoon is less than 30 days old, it can take some time for it to be registered, so try registering after 30 days.