Hi flashking. Like i said in my earlier post, i was able to get the GSM modem working well with Hyperterminal using AT commands. Presently , i have been able to create a virtual serial port for the LPC 1768 MBED that i am using (since it connects via USB) by installing serialPC driver and it works better with TeraTerm. My challenge now is how to send AT commands to the modem through the MBED and also get the normal modem response from the modem unto my MBED. If anyone has an idea of how i can pull this through, i will much appreciate your contribution. Thanks.