I've flicked the switch on the underneath of the phone. Turns the ringer off.
I can still call out if I need to, but I don't get disturbed.
Anyone who actually needs to get hold of me calls my mobile anyway.
It's usually only when I have to call insurance companies when I reach for the landline.
Back in September I tried to call to sort out the Vara's renewal.
No dial tone. Discovered that sometime between sorting SWMBO's bike insurance in Feb and September the cable on the outside of the house had snapped.

Jen said we need to sort it for emergencies. Emergency services will know where you are with landlines but require you to say where you are on a mobile.
Virgin sorted it for free and 'upgraded' us to the fibre optic landline they are rolling out.

If the phone rings and I notice the little light on the phone I leave it ring and see if they call my mobile.
If they don't it means cold call and not someone I wish to speak to.