Hi @adavid27, thanks for your post although I'm sorry to hear of your concerns raised.
It all depends on the date we've given you for our proposed install, but if you want to time the cancellation of your BT contract for the date we've given you then that generally works best for lots of customers.
However, it can vary if you're porting a landline number over from your previous provider - it's just not apparent if you're referring to this in your original message unfortunately.
Can you please confirm if you're porting your landline number over from BT?
Many thanks
Tom_W