i wanna connect to a nokia phone and talk to it with AT commands. I'm using .Net c#. i find a article in MSDN which is about this topic.(http://msdn.microsoft.com/msdnmag/is...netserialcomm/) When i use the sample application in the article to talk with the nokia phone, it seem to be connected, but no reponse with any AT command (e.g. AT, ATI1). However the same application is work with an USB modem. And both the USB modem and the phone also work with Hyper terminal.
Do anyone have idea with it?
Or anyone encounter the same problem?

i'm using 6230 with a DKU-2 cable.