does the serial port also receives some data when a gsm device connected with that port finds some incoming sms or call ???

hi i m working on a C# Windows form application that could send/receive sms and make/receive calls through the GSM modem using AT commands... i m able to send sms msgs and make calls but

1) i am yet unable to find out the way of how to notify my application when an sms is received on the mobile phone so that i can read it using some at commands

2) how to detect in my application if there is a call coming in on the mobile phone?

3) if the connection is established between the mobile gsm or a GSM modem,,, and next if the gsm device receives an sms or a call does the port also receives some data ???

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farooq.hnf