Landlines
It’s been roughly one and a half decades since landlines were actually a thing. Landlines became obsolete as soon as smartphones became cheaper and more common. Nobody answers calls from strangers nowadays, and since you can’t identify the caller with your landline, you might as well get rid of it. Make sure you inform your phone company, so they’ll know not to charge you.
Keep in mind that this tip comes from home designer gurus who might now know what you still have a landline around. If you use it for business, feel free to keep using it. Just try and keep it somewhere where people won’t see it, like your basement.