So this:

That is not a standard Wavecom modem!
It’s made to look a lot like one - but it isn’t:
- Wrong logo strip
- wrong power connector
- wrong serial port connector
Pretty sure that HSDPA hadn’t been invented at the time of the Q24
I think you’re going to have to take this up with “Quasar UK”
Please set AT+CMEE=1 to get the extended error information.
+WIND: 3 = ready for AT commands (with exceptions)
+WIND: 13 = SIM Rack closed
+WIND 13
+WIND: 1 = SIM inserted
+WIND: 4 = ready for all AT commands
+WIND: 10,"SM,0,“FD”,0,“ON”,0,“EN”,0 = phonebook reload status
+WIND: 11,“FD7A30FA0E6F1DFBD9D101B983CDC6E6”, = phonebook checksum