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Hello,

I have a SIMCOM A7670E module. The module works fine for the regular commands such as -

Now, I am trying to get the sim card functionality up and running so as to send an SMS. I have inserted my SIM card into the holder, in the right way. When I query the sim card status, I get -

AT+CPIN?

+CME ERROR: SIM not inserted

Is there any special command to enable sim card detection? I went through the datasheet and could not find any.

Also, I notice that the SIM_VDD pin has no voltage on it. Does the SIM card need to support the IMEI number of the module to be able to detect it?

I am currently powering the module through a USB cable. Is that sufficient or is it only for communication and I have to use an external supply to one of the connectors. For reference, this is the module that I have - CRT01260S.

Please let us know if there's anything that's missing in the approach. Thank you.