How about a "GottaGo" call? It's a new feature from Private Phone, and it's free!
Private Phone is pretty cool, it's a free voicemail number that you can use in situations where you don't want to give out your real number. I use it for filling out forms when I do reward programs and have to fill out my info. And now they have a call-back feature that will call you so you can get out of a bad date, boring meeting, etc.
Privatephone - Free Private Phone Number and Online Voicemail by NetZero
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