I am no longer able to see the page with my bills and plans anymore
Are you a BT customer or have you migrated to EE? IF the latter you need to post on EE forum https://community.ee.co.uk/
Hi @Ansmarie1 you can't have an EE account number on a BT ID.
If you have your services with EE you'll have an new EE ID for the EE website/app.
Thanks
Neil