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problem to code using AT89c51

Hello, scholars

I have to use some part of code only at the time dumping the program into micro controller.
EXample: receiving the mobile number and saving it
in RAM with the help of user inter face.
By using that number i need to send SMS continuously.
If I want to change the number, i could be able to change by using personal computer .
At the time of changing the mobile number only user inter face part of code must execute.

kindly help me in this regard
Thanks
srinivas

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