The phone works fine as a phone, it's the Alexa functionality that we need for my grandmother's sight impairment unfortunately.
And from what I've now tried and from what I've read, a BT hub will definitely not work on an EE phone line/ subscription unfortunately. Broadband works. And the phone connects to it, but has no service.
Thank you for your reply and that is the same as I found out. I was hoping you had found out a way of getting Alexa to work on it which is strange as they’re one company now