I'm always glad when someone calls and I always call people instead of typing down thoughts. Even better than calling is meeting someone IRL, but of course that's not always feasible. Then I usually begin by telling him or her how grateful I am that somebody is choosing the direct way over some form of texting and there are, sadly, far too many. Like your dad, I wouldn't buy anything not specially designed for transmitting voice in an analogue fashion. Too few options there, recently... Most of the people I communicate with are aware of this, thank goodness, but it's always hard to tell new acquaintances that I don't use Viber, Whatsapp, Facebook and even reluctant to use SMS.