The SIM900 is a 4-frequency GSM/GPRS module that can be used to connect to the cellular network. It supports the 850MHz, 900MHz, 1800MHz, and 1900MHz bands, so it can be used in most countries around the world. The SIM900 also supports SMS, MMS, and GPRS, so it can be used for a variety of applications, such as:
The SIM900 is a versatile and powerful module that can be used in a wide variety of applications. It is easy to use and can be interfaced with a variety of microcontrollers.