Voice recognition technology? Hey, I must check out my new cell to see if I have that. But I can just imagine the scenario if I get a cold or flu and my voice changes. How to convince the bloomin' machine I am who I say I am without sounding like Popeye?
Tolkien names would be good, but I'd have to remember them, so I couldn't let mine get too fancy. Would I remember that "Call Mr. Bliss" is my garage mechanic? That "Call Annatar" is for Santa/the North Pole? I'd use Dol Guldur for the boss only I don't have one. "Call Minus Teeth" might be easy to remember for the dentist. Ditto "Call Athelas" for the local pharmacy. But I bet I couldn't remember that "Call Old Man Willow" is the Income Tax Number, at least not for long after the April deadline for tax submission.
As for home, I guess I'd have to stick with "Call Bombadil."
