Sigfox modules are usually controlled with AT commands. In this article you can find list of basic AT commands which should work with almost every SIGFOX chip you can find. If you miss any “universal” command, please post it to the comments, so I can expand the table.
One of the biggest problem of the IoT world is to choose one appropriate way how to get data from/to your device. Few years ago, we could use mostly GSM networks, which is expensive and power consuming (and that is a problem for devices powered on batteries). Let’s see what options we have now. You