They're certainly useful tools. It is an absolutely wonderful thing with regard to my career, as it allows me to leave the house when I'm on call.
I have the cheapest, simplest phone possible. I want to replace it with something more modern, and will eventually, esp. if it wears out or breaks. That said, I'm worried that the new ones won't tolerate my abuse the way this old beater does. I've dropped it more times than I can count.