Albert: RBox - Raspberry pi Zero + USB 3G internet + XMPP = awesome IoT device
Build a router with mobile connectivity using Raspberry Pi | Opensource.com
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 :
3G Internet on Raspberry Pi – Success! – Terence Eden's Blog
Amazon.com: waveshare SIM7600G-H 4G DONGLE LTE USB Adapter for Industrial Grade 4G Communication and GNSS Positioning,Support/PC/Raspberry Pi/Drone/Industrial Computer,150Mbps Downlink Rate,Global Band Support : Electronics
LTE uplink for Raspberry Pi: Huawei E3372 vs Waveshare SIM7600E-H -
DOWNLOADS and RESOURCES :: LTE CATM1 / NB-IOT / 4G / 3G / 2G [GSM] IoT MODEMS [SHIELDS] for Arduino, BeagleBone and Raspberry PI; environmental sensors for IoT
Wholesale 3G 4G EC25-AU Module LTE USB Dongle Modem Cat4 150Mbps Linux Android Raspberry Pi Used in Latin America, New Zeland, Taiwan From m.alibaba.com
How to fit a Raspberry Pi with mobile connectivity