Don't buy a GSM module, use your old phone!
So recently I've been doing a lot of wireless projects, mostly based around a Bluetooth module but since then I've wanted to move on and start making my projects SMS or Phone call controlled which is almost just as easy with the help of a GSM module, however, a problem occurred... They're expensive!...
By: electronics for everyone
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By: electronics for everyone
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[original story: Instructables]