I'm not sure how much I can offer by way of fleshing out the scenario, but I do already have a mythical creature in mind. Honestly I think a chill setting where mythical beings can learn how to use smartphones just sounds like a delight right now xD

I do like the idea of a couple of human students learning the fae ways to go to Faerie. They'd be pretty valuable study partners, wouldn't they? Also gives rise to some fun shenanigans as humans and fae try and fail to understand each other ^_^