Landline Phone Features

My landline is out of order. How do I call forward to my mobile phone?

Hi!My wifi home phone,(digital phone?) gets about 30 "unavailable", "suspected spam", "telemarketer" and calls from hijacked numbers. I am on the state and federal do not call lists. I have the call screening service thru ATT. And I have blocked a lot of numbers manually. Still, I get about 30 calls