Microcontroller-based telephony has a myriad of applications in the real world, from the banks and financial institutions sending out tons of alert SMS messages to their customers, to advanced smart city travel systems sending out traffic updates via SMS to their subscribers. GSM/GPRS is a very popular method of implementing a field solution, be it for telephony or for the Internet of Things (IoT).
Global System for Mobile (GSM) communications is based on second generation (2G) telecommunications protocols, whereas General Packet Radio Services (GPRS) is primarily used for mobile data service over 2G and 3G telecommunications protocols.
The following figure shows a typical GSM module that can be interfaced and used with the Arduino platform:
As shown in the preceding figure, the GSM module is an integrated electronic board that houses...
