... reference. SIMCom presents an ultra compact and reliable wireless module. The SIM900 Quad-band GSM/GPRS ... standard interface, the SIM900 delivers GSM/GPRS 850/900/1800/1900MHz performance for voice, SMS, Data, ... demandof design. General Features - Quad-Band 850/ 900/ 1800/ 1900 MHz - GPRS multi-slot class 10/8 - ... GSM phase 2/2+ – Class 4 (2 W @850/ 900 MHz) – Class 1 (1 W @ 1800/1900MHz) - Dimensions: ...