How to forward recieved SMS on SIM900

Hello Arduino friends!

I am trying to forward the recieved SMS on the SIM900 to an another mobile phone and I don't know how to do it.

I'm using an Arduino UNO R3 and an Epalsite SIM900 shield.

I can send SMS using simple codes, also I can send SMS by serial writing without any problem. I have also printed the recieved SMS into the Serial port. Now I would like to forward the incoming SMS to a specified number. I have tried to mix the "send SMS code" and the "recieve SMS code" but I cannot get it. I thought that just using the same base of "recieve SMS code" and after print the text on the serial, just use the same variable to send it like "send SMS code" would work, but is not that easy.

Could someone help me on forwarding SMS?