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Amazon.com: EC Buying GSM/GPRS/GPS/Bluetooth SIM868 Expansion Board, HAT Expansion Board GPS Module SIM868 Compatible with Arduino/Raspberry Pi , Send SMS, Bluetooth 3.0 Data Transmission : Electronics
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Adafruit FONA 808 Shield - Mini Cellular GSM + GPS for Arduino : ID 2636 : $49.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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