1,GSM/GPRS module 2,wireless module 3,simcom GSM/GPRS Module SIM4100 SIM4000B 1,GSM/GPRS module2,wireless module3,simcom GSM/GPRS Module ... dual-mode TD-SCDMA module which works at 2010-2025MHz on the TD-SCDMA mode and Tri-Band 900/1800/1900MHz on the GSM ... mode.The leading features of SIM4100 make it ideal for virtually unlimited applications, such as WLL applications (Fixed cellular terminal), ...