Was the BT Broadband account that was at your mum's fully in your name as the account holder, not just that you paid the bills?
Was your email address set up from that BT Broadband account?
Do you have access to the MyBT in relation to the broadband account?
Have you checked by logging onto your MyBT using your BTID then going to My Products, to see if the Email, Manage section is still there and if it is can you click on it and see if your email account is there?
Have you tried logging onto your email account using a web browser and not the email app on your phone?
Are you able to check if you can log onto the email account using a web browser on a computer or laptop?
If your email account is a BTBasic account then yes if you pay £7.50 per month you would be able to use it with an email app.
See link.
BT Email products | Email Help | | BT Help
but I would suggest before doing that you make sure you can access the email account now to establish if it is still available to be accessed even as a BT Basic email account and if not why not.
