There's one thing I've never understood, and that is why there is only one type of phone call.
Now, you're all familiar with the varieties of phone calls that can happen to you: the call from that employer that you got the job, the call from an old friend you haven't heard from in ages, the booty call, the - it goes on for a while. But they are all, in a technical sense, just calls, and if you ever miss one of them, the only metadata you'll get is that you missed it, when and from who. With no indication as to what the whole point of it was.
It is more than technically possible to implement a system wherein the caller adds some useful context to their callings. Such as "hey, this is just a social call, no worries" or "booooooooooty call" or "look, I know things are tough between us right now, but there's a situation with the kids that requires the both of us", or - well, this list also goes on for a while, but you get the idea.
Why is this not a thing?