I typically use this Pulse Electronics U.FL antenna in a pinch, but there are many options for different needs (e.g. An antenna-most modems have plugs for LTE main, LTE diversity, and GPS/GNSS.AT&T, T-Mobile, Verizon in the USA)-though you have to make sure the carrier you use works with the LTE modem you have! You could also get a plan and SIM from any major carrier (e.g. You could pull out the SIM from your mobile phone (on most carriers at least) but that is a bit inconvenient as your phone won't get service until you put the SIM back in. I bought a SixFab SIM and used their monthly pay-as-you-go service for testing. I used this one from Timack but any should do-just make sure it has a SIM try built-in! There are even Pi HATs like this one that place the modem hardware directly atop the Pi.
(If not using a CM4 + LTE carrier board) A USB to mini PCIe adapter with built-in SIM tray. I used a Quectel EC25-A, but there are some from Sierra Wireless I've heard recommended too. A Raspberry Pi (almost any will do, though I used a Raspberry Pi 4 (with a USB adapter) and a Compute Module 4 (with a carrier board with a mini PCIe slot). The hardware requirements are not too bad, and remarkably affordable. Or point out places where I'm glaringly wrong :) Hardware Hopefully you can learn something from my notes. (Or why someone should care about random terms like PPP, ECM, QMI, or MBIM, or why someone would choose qmi_wwan over cdc_ether, or. There doesn't seem to be any good central resource for "4G LTE and Linux" out there, just a thousand posts about the ABC's of getting an Internet connection working through a 4G modem-but with precious little explanation about why or how it works. This post is the culmination of 40+ hours of reading, testing, and head-scratching. I figured I'd document the process in this blog post so people who follow in my footsteps don't need to spend quite as much time researching. 
For a recent project, I needed to add cellular connectivity to a Raspberry Pi (actually, an entire cluster.
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