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dual serial communcation

hi,

in my project i have to use 2 uart in 8051 micrcontroller. i am using gsm and gps in my project.my problem is when i receiving gsm sms i have to send gps value to same number . the mobile number is not stored in software.we can receive sms form any mobile number and reply to that number.how to handle this problem? suggest me best thing

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