The iPhone has a setting that has you route unknown callers to VM ("silence unknown callers"). I used to do the silent-answer trick, but this is so much better

The iPhone has a setting that has you route unknown callers to VM ("silence unknown callers"). I used to do the silent-answer trick, but this is so much better. If it's important,I get a vm and I'll call right back. The times it has failed me is, actually, right now. I put in a call to have a delivery, maybe the last four digits are 4700- I've plugged that number in. But the guy calling me back calls on 4709 and gets VM. So I have to remember to turn this off if I'm expecting a delivery.