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Giving the Raspberry Pi a Serial Modem Using the HUAWEI E3531 USB Dongle (+ Send SMS) : 6 Steps - Instructables
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Send SMS with USB GSM modem when alarm triggered - #198 by bigsem89 - Share your Projects! - Home Assistant Community
GitHub - colins44/gsm-sms: A small python script that allows you to send, receive and delete SMS's using a USB GSM dongle modem
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