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Adafruit FONA 808 - Mini Cellular GSM + GPS Breakout : ID 2542 : $49.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: for Raspberry Pi GSM/GPRS/GNSS Bluetooth HAT Module SMS GPS UART Based on SIM868 for Raspberry Pi 4B/3B/3B+/2B/Zero/Zero W Support Phone Call Speaker Global Position Transfer Data @XYGStudy : Electronics
SIM808 GPS/GPRS/GSM Arduino Shield - RobotShop
Mini Magnetic GPS Tracker Real-time Car Truck Vehicle Locator GSM GPRS - Walmart.com
ZX908 Mini 4G GPS Tracker CAT1 PCBA Chip Board For Vehicle Car Person Tracking System Wireless WIFI Beidou Satellite Locator - AliExpress
GSM-GPS click — board with SIM808 module
GSM/GPRS/GPS Shield (B), Arduino Shield Based on SIM808
Overview | Adafruit FONA 808 Cellular + GPS Shield for Arduino | Adafruit Learning System
GPS/GSM Vehicle Tracker/Recorder – Viktor's DIY Blog