I just purchased a little black box with this module inside from a Hong Kong website. The module is placed onto a very small daughterboard with just a condenser mic on it and 7 solder pads, connecting to the serial port. My intentions are to use the module with a microcontroller.
I hooked the serial port to a CMOS-RS232 converter and inserted a SIM card which works, but the module does not connect to the GSM network.
A short test reveiled the following:
It seems the module has an invalid IMEI! Is there a way to replace the IMEI with a valid one?