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Interfacing modem to microcontroller

Hello everybody,
I am monitoring a status of a sensor interfaced to P89V51RD2(8 bit controller)and want to send a SMS to any mobile number fed into the controller.But i am not getting the GSM modems in which i will insert a sim card and can be interfaced to my board.Can anybody of u provide me some links or Lists of GSM modems which can be selected for this purpose.
Thankyou
Regards
Sagar

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