Acmecorporation is able to use the aptly named TOWA Phone (There Once Was A Telephone) to make and receive calls, send single DMTF tones, and even program numbers on speed dial. Aside from its classic bell ringer, there’s an RGB LED that indicates GSM status: red for offline, green for online, and blue for an incoming call.
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![While cleaning out his closet, Instructables user “Acmecorporation” discovered an old rotary telephone. Instead of tossing it away, the Maker decided to give the old-school device some modern-day technology using an Arduino Pro Mini and a SIM900 GSM shield.](http://
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<p> <img style="float: left;padding-right:5px;" src="https://cdn-blog.adafruit.com/uploads/2016/05/50-06-150x113.jpg" alt="50-06" width="97" height="72" border="2" />Each Monday is <a href="https://blog.adafruit.com/?s=arduinomonday">ArduinoMonday</a> here at Adafruit! Be sure to check out our <a href="https://blog.adafruit.com/category/arduino/">posts</a>, <a href="https://learn.adafruit.com/category/learn-arduino">tutorials</a> and new <a href="https://www.adafruit.com/category/17">Arduino related products</a>. Adafruit manufactures the Arduino right here in the United States in cooperation with arduino.cc. We have a huge selection of Arduino accessories and all the code and tutorials to get you up and running in no time!”>Arduino Blog</a></p>
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![ArduinoMonday](http://
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<p> <img style="float: left;padding-right:5px;" src="https://cdn-blog.adafruit.com/uploads/2016/05/50-06-150x113.jpg" alt="50-06" width="97" height="72" border="2" />Each Monday is <a href="https://blog.adafruit.com/?s=arduinomonday">ArduinoMonday</a> here at Adafruit! Be sure to check out our <a href="https://blog.adafruit.com/category/arduino/">posts</a>, <a href="https://learn.adafruit.com/category/learn-arduino">tutorials</a> and new <a href="https://www.adafruit.com/category/17">Arduino related products</a>. Adafruit manufactures the Arduino right here in the United States in cooperation with arduino.cc. We have a huge selection of Arduino accessories and all the code and tutorials to get you up and running in no time!”>Read more</a></p>
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<p>Each Monday is <a href=){kind=link}