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SIM800 Series_AT Command Manual_V1.09  21  2015-08-03 
20.2 SIM commands  Add examples of "AT+CENG" 
21.11 AT+CMMSDOWN  Add difference of "AT+CMMSDOWN" 
21.12 AT+CFGRI  Add difference of "AT+CFGRI" 
21 
Add differences of SIM800A,SIM800F and 
SIM800C-DS