Go Create! :: Raspberry Pi & Accessories :: Raspberry Pi :: Waveshare 4G / 3G / 2G / GSM / GPRS / GNSS HAT for Raspberry Pi, LTE CAT4, the Global Version
Raspberry Pi 4G/LTE Modem Kit - Sixfab
USB modem power issues
Sierra Wireless MC7304 Modem QMI Interface Setup
3. Installing 4G USB modem to Raspberry Pi – RC Bellergy's Drones
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 :
Build a router with mobile connectivity using Raspberry Pi | Opensource.com