Carphone Warehouse's new network "ID"

1) Just tried to check coverage on this link, but they've forgot to add in the bit to check coverage. I think the link to Three is missing.

https://www.idmobile.co.uk/help-and-...verage-checker


2) Registered with my details for the account but comes up with "We didn't recognise those details. Please try again or click 'Register'". Happy to take my money though.