Question : Ericcson GH688 AT commands

Hello
I wish to create an application that reads various stuff from my ericsson gh688 mobile like:
Read the callers number when receiving a call
Read an SMS

But trying test the AT commands using the win Hyperterminal I found that most command return error

What could be done
Thanks

Answer : Ericcson GH688 AT commands

AT+CMGL will read all messages or just unread messages etc.. AT+CMGR will read one message and so on. You'll first need a description of all the AT commands one could use (GSM 07 from www.etsi.org). Then, because the message format is horrible, you'll need a description of the PDU and how to encode/decode it. There's a Perl module (PDU.pm) freely available. But this only all works for GSM compatible phones.

So, what next?