... band GSM/GPRS module 2.GSM/GPRS 850/900/1800/1900MHz sim900b module original stock SIMCom presents ... -standard interface, the SIM900 delivers GSM/GPRS 850/900/1800/1900MHz performance for voice, SMS, Data, ... Name: SIM900B General features Quad-Band 850/ 900/ 1800/ 1900 MHz GPRS multi-slot class 10/8 GPRS mobile ... GSM phase 2/2+ -Class 4 (2 W @850/ 900 MHz) -Class 1 (1 W @ 1800/1900MHz) Dimensions: 40 ...