SIM800L GSM Module
The SIM800L module enables communication via the GSM mobile phone network. In addition to SMS and the internet, voice calls are also supported, provided the speaker output and microphone input are brought out as pins. There are various modules for microcontroller tinkering. Among others, there is also an add-on for the Arduino Uno. The SIM808 and SIM900 modules are similar to the 800L and can usually be controlled with the same library.
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