This is an ultra compact and reliable wireless module. The SIM900A is a complete Dual-band GSMGPRS solution in a SMT module which can be embedded in the customer applications allowing you to benefit from small dimensions and cost-effective...
The GSMGPRS TTL UART Modem, from rhydoLABZ, is built with Dual Band GSMGPRS engine- SIM900A, works on frequencies 900 1800 MHz. The Modem is coming with selectable interfacing voltage, which allows you to connect 5V & 3V3 microcontroller directly...