The SIM card’s key function is in its name: the Subscriber Identity Module. It stores information that is used to identify and authenticate users, and to connect devices to the Global System of Mobile Communications (GSM). GSM has been the standard for cellular communications since the introduction of 2G, and advances in SIM card technology have followed closely behind advances in GSM.
AT&T’s shutdown of their 2G GSM/GPRS network has begun and will be complete in 21 months. If you have been in the M2M/IoT industry for a while, you know that the technology and networks are continuously evolving. In fact, there have already been two cellular technology sunsets in the recent past (the ANSI-136 TDMA shutdown in the early 2000’s and the AMPS Sunset in