The class library that will be used in this section and that needs to be imported is:
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Adafruit_FONA (Author: Marc Plouhinec, Jun 2015, search: "Adafruit_FONA") - Class library for a SIM800/808-based GSM module.
The following example programs will demonstrate the principles of using a SIM800/808 GSM module using the Adafruit_FONA class library: