How to clear a buffer stored in SIM card in the event of receiving a new text

Projects Programming
1

I have a buffer to store the text messages (SMS) - char replybuffer [255].

How can I clear this buffer so that until I send a new text message the buffer, it should keep sending SMS to the old number and upon receiving number (sent in the form of text) it should read only the new number in the text?

What I'm finally trying to achieve is- I have a command to send the SMS after reading the mobile number stored in the buffer

fona.sendSMS(replybuffer, "GOT IT");

Here, I'm only able to send the SMS to the number stored in 1st text.

The command I'm using to delete the SMS is:

 fona.deleteSMS(0)

My logic to trigger the SMS:

  if (valCO1 < 5 && valCO2 < 5 )
// need the update buffer logic here I guess
  if (millis() - startTime > 1UL*60UL*1000UL) {  
        startTime = millis();
      //sendAlert();
       fona.sendSMS(replybuffer, "GOT IT");
        }
2

Here, I'm only able to send the SMS to the number stored in 0th location of the buffer.

The 0th location of what buffer? If you are referring to replybuffer, you are NOT storing a 10+ digit phone number in the 0th location.

3

Yes your right. My mistake, I meant the first message. So how to delete the first message in the buffer upon receiving the new message? Currently, my send command:

fona.sendSMS(replybuffer, "GOT IT");

is only considering the first message but not the latest.