This is an interesting little door/phone hack.  A guy made his door unlock-able (and vice versa) via text message.

You can leave your keys at home with this clever hack by Billy Chasen, who rigged up his deadbolt to a Propeller-based Spinneret Web Server. Using an SMS gateway called Twilio, he can open and close the lock by tapping out a quick text message. Not only that, but the system also responds to acknowledge his request. For security, there’s a whitelist of permitted senders.

[quote and source is from MAKE blog]

Now I probably wouldn’t use this for my house door or for anything real important but I’m already thinking of some great uses for marketing and promotion.  You can throw a very secret party and people have to send an email to someone so they can be put on the “whitelist” that allows you to unlock the door and get it into the party…or maybe it could be used in a scavenger hunt (urbandare.com) where you have to find the secret phone number that allows you to open the door to pick up a clue or something.  Or maybe you can use it to access a secret room in a store to have access to special products.   I could keep going but I think you get the picture.

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