GSM is a globally accepted standard for digital cellular communications.
GSM uses narrowband Time Division Multiple Access (TDMA) for providing voice and text based services over mobile phone networks.
This tutorial has been designed for readers who want to understand the basics of GSM in very simple terms. This tutorial provides just about enough material to have a solid foundation on GSM from where you can move on to higher levels of expertise.
A general awareness of some basics of telecommunications is sufficient to understand the concepts explained in this tutorial.