The identity of the sender is attached to the SCCP packer of the SMS. The SMS once reach the SMS gateway is routed to the destination Gateway and
then to the receiver's handset. There are many ways by which we can send SMS to the SMS gateway. One of them is to use internet. Now the concept of SMS forging lies in changing the SCCP packer which contains
the sender information prior delivering to the SMS gateway. The intruder can change the SCCP packet and can send that packet to
any of the receiver as a spoofed SMS. Some of the Website on the net also provide this facility. To provide such service is not legal and the user using this may lead so
serios consequences with law. So i request you not to use this kind of trick to spoof SMS and above info
was only for educational purpose.