AT Commands

AT Commands Guide for GSM

18.01.2022 Let's take a deep dive into the world of AT Commands: what are they and what are the most common AT commands for 2G, 3G and 4G cellular modules? We will try to answer these and many more questions in this complete guide about AT commands for cellular networks. AT Command Guide - Table of Contents What are AT commands? What can AT commands be used for? What is the syntax of AT commands? Do different modules and vendors have different AT commands? How do I identify proprietary AT commands? How do I find the AT commands my modem supports? My AT-command only responds with ERROR - how do I get more info? Basic commands to get information about the modem and SIM card Removing or adding SIM PIN via AT commands AT commands for network selection and configuration AT commands for radio signal quality analysis AT commands to establish a PDP context / data session Final thoughts