> My overseas family had such a long number, stored in a book in my grandmothers handwriting, that theres little chance I would have connected and woken them up.

The article is about a phone with one button per person, so the thing that stopped you from doing this is not applicable. You now have a toddler who can press a button whenever they want and dial someone - you don't see how a child who doesn't understand timezones etc. might cause a problem here?