Send AT commands

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Hello everybody.

I´m trying to send to the modem an AT command to send an USSD code but I´m having some troubles.

I open port number 2 (I think is the modem port...) and send ATD*121#\r
but using the atdbg program I get:

ERROR: Header error -<0> +<f1>
<Tx:19041D>
ERROR: Header error -<f1> +<ee>
ERROR: Header error -<ee> +<e8>
Tx:AT\r
ERROR: Header error -<e8> +<5b>
...
...

I know that I have to send ATD*121#\r to the modem because using atdbg when I dial directly the ussd command *121# code, I get ATD*121#\r.
What I´m not sure is the way to send it to the modem.

Any idea of how to do it or where to get information??

Thanks in advance and sorry for my english.

I´ve just read that I can´t open port 2 without crashing the communication between "celltsp.dll" and the gsm-module, so I guess that´s not the port to open.

How can I send then AT commands to the internal modem ??

Thanks in advance again.

check out the source of xdaunlock. that shows how to do this.