https://www.bt.com/help/landline/manage-service/i-want-to-change-or-cancel-my-services/i-want-to-stop-my-bt-phone-line
I want to stop my BT phone line | BT Help
Find out how to cancel your BT phone line, including how to contact us and how much notice you need to give.
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https://www.bt.com/help/mobile/how-do-i-set-up-my-phone-manually-to-work-with-bt-mobile-
How do I set up my BT Mobile manually? | Mobile | BT Help
If you want to set up your BT Mobile yourself, here are the steps to follow and the settings you need.
how do iset upmy btmobilemanually