How to fit a Raspberry Pi with mobile connectivity
Amazon.com: 4G / 3G / GNSS HAT Module for Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+/4B/Jetson Nano, Based on SIM7600A-H , 4G Communication and GNSS Positioning Module Support LTE CAT4 up to 150Mbps
Guide by Tim; 4G and GPS HAT For Raspberry Pi - Waveshare SIM7600X - Guides - Core Electronics Forum
Raspberry Pi : How to access the Internet using GSM / GPRS Modem (SIM900/SIM800)