Global System for Mobile communication (GSM) is a popular world-wide standard for mobile telephone systems. GSM includes technologies in which both signaling and speech channels are digital. GSM is considered a Second Generation (i.e., 2G) mobile phone system. This also facilitates the wide-spread implementation of data communication applications into the system. Additionally, GSM implements a Short Message Service (SMS), also called text messaging. The M2M board has AT commands for most GSM needs including voice calls, fax, and SMS. It also features a phonebook to store phone numbers and contacts. The on-board LEON-G200 has 1Mb of memory to store everything, such as phone numbers, or files from the Internet.