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How-to: Craigslist phone verification type system

2 points by apollo ↗ HN
How would I go about building a craigslist-type phone verification system, which, when given a phone number, either texts or calls the number with a code that the user can use to verify that it's their phone?

7 comments

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timf
Check out http://twilio.com for making voice calls programmatically.

e.g. http://www.twilio.com/docs/demos/appointmentreminder

timf
Twilio rocks. I just got it going with Python from our chat system at work... took about 20 minutes.
fuzzmeister
Using an SMS aggregator such as CellTrust, you could send the user a code through a shared short code. Or, if you're willing to put up with short ads at the bottom of messages, you could try TextMarks.