Hi everyone...

As the title suggests, need to know if an incoming message is in response to one sent, I'll explain:

If a phone [A] sends an SMS [X] to a phone [B], to open the message X in B creates a message [SMS Y] as response to the SMS X and that is sent to A.

In the phone A to receive the SMS Y, how I can know that SMS is in response to X?

Is there any way of knowing?