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if keypad is interfaced with microntroller than is it possible to give AT commands to gsm directly through microcontroller without using hyperterminal.
if it is a numeric keypad then you should write your program in such a way that,
whenever ‘1’ key is pressed “AT” command is sent ,
whenever ‘2’ key is pressed “AT+CMGF=1” is sent ….like this you should write your program.
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