Good day, I am using the firmware "1137B08SIM900M64_ST_DTMF_JD_MMS" and would use the commands "AT+DTAM" and "AT+CFSINIT" but the module SIM900 is returning "Error". How do I use these commands?
PS: I also need to use the command "AT+DDET".
AT+CGMR
Revision:1137B08SIM900M64_ST_DTMF_JD_MMS
OK