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https://blog.arduino.cc/2013/03/19/make-a-voice-call-with-arduino-gsm-shield/
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Mar 19, 2013 - Some days ago we launched our new product, the Arduino Gsm Shield, together with an intro video explaining how to make the first steps into the creation of...
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https://www.qualcomm.com/news/releases/2002/03/qualcomm-demonstrates-worlds-first-wireless-gsm-voice-calls-using-umtsgsm
Qualcomm Demonstrates World's First Wireless GSM Voice Calls Using UMTS/GSM Single-Chip Multimode...
ORLANDO, Fla. -- March 18, 2002 -- Qualcomm Incorporated (Nasdaq: QCOM), pioneer and world leader of Code Division Multiple Access (CDMA) digital wireless...