R800C GSM/GPRS HAT - Waveshare Wiki
Key:communication:gsm-r - OpenStreetMap Wiki
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GsmProtocolFamily
File:Gsm network architecture.png - Wikimedia Commons
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Microduino-GPRS/GSM - Microduino Wiki
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GSM - Wikipedia
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BPI-GSM module - Banana Pi Wiki
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GSMA - Wikipedia
![gsm [wiki]](https://jenda.hrach.eu/w/_media/gsmstack.png "gsm [wiki]")