Voice calls are good. Sometimes it's good to hear a friend or relative's voice, as much as the content of the conversation. Voice is also useful in that it's an instant form of communication and you can be sure the message has been received and reasonably sure it's been understood, though of course you can't be sure it will be acted on.
In fact, for all Kim's scepticism, she's had two voice calls with me! Both were quite useful; one earlier this year was "Drive down this road, knock on this door and I'll make you a cup of tea," one several years ago was "Help! You're meant to be leading this ride and you've lost me. Where are you now?"
A landline, however, seems like a particularly restricted form of voice call device which doesn't do anything else and only operates in a fixed location. I suppose if you have one anyway bundled in with cable TV or something you might as well take it, but I can't remember when I last used one. Whether landlines are any more or less liable to nuisance calls than mobiles I don't know but rather doubt.