Modem LTE/3g /2g with raspberry pi 3/4 A+/B+... - Hackster.io
4G/LTE Cellular USB stick for Raspberry Pi – ADSBexchange.com
Raspberry Pi - Huawei HiLink E3256 3G mobile broadband USB dongle to RJ45 ethernet router
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