My mother in law’s phone is not working

[Christine19461]

My mother in law is unable to dial out, it says line in use sometimes but not all and asks to check the line - incoming call has a lot of interference when does get through and phone has been ringing in the night. Broadband also appears not to be working.

[Mark39]

Does her phone plug into a wall socket? 

Does the wall socket have separate ports for broadband and phone, or just one port?

If it's a single port, is the phone plugged into a microfilter?

Is she able to run the connection test here: https://www.sky.com/help/articles/broadband-diagnostic-start