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GSM modem interfacing with 89c51

I am able to send msg through GSM modem.
But i am not able to read msg.
Somebody plz help me.

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  • sir, i am interfacing GSM modem with MSP430.
    By sending AT commands, i am sending msg through GSM modem.
    GSM modem gives acknoledgement such as if i send "AT" command, GSM modem send acknoledgement "OK" on Hyper terminal.
    This acknoledgement i am not recieving on MSP430 controller.
    And also i can not able to read msg stored on SIM memory.