I've been wishing there was a layer between my phone and me that said, effectively, "You've reached David's phone - if this is an emergency or he's expecting your call, press 1; otherwise, press 2 to set up an appointment for a later call, or 3 leave a voicemail message." Where 2 would talk to my calendar and ideally their calendar and figure out a time that works for both of us without my involvement. Sure, people could just mash 1, but people always have an option to be rude when there's interpersonal interaction going on, and at least this way they have a way not to be rude while still reaching out to me by phone, and a way to actually get through to me in an emergency.
Mr. Number (for Android) comes somewhat close. You at least have the option of determining who can get through to you.
I'd prefer something more configurable as well -- priority list of who can reach me at any time, during daylight hours, when I'm generally open to talking, and never.
As well as a way for those with at least some level of trust (and, say, emergency services) to reach out to me directly.
Combination of Mr. Number and a pretty acerbic voicemail message ("Hi, you've reached me, don't leave a message, email me instead, if you're a good friend, feel free to text") low-techs this solution for me.
with gvoice, people can leave a voicemail that gets transcripted (vaguely) and texted to me. I glance at the text and decide if I want to call them back or not.
I love that capability, but it's not quite everything I want - I do want a way for people to loudly interrupt me in the case of a genuine emergency, but I want them to have to reaffirm that most of the time. The hands-off scheduling would be nice, too. But for what it is, it's rad, to be sure.
