i'm working on making an sms controlled relay, using an atmega 328 p based arduino board and a sim300 for this. i've been able to recieve and read txt msgs and evn send txt msgs to a hardcoded number. but now, i wanna send a reply to whichever number the txt i recieve comes from.
i've read the incoming txt n stored it in an array. i've tried storing the sender's number in another array n send an sms to that number, but it dint work. any hel plz?
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