Pass authentication process

[DRNewcomb]

Originally Posted by morningboy

I know this is unsecure, but can we actually do it ?. by configuring MSC hardware or SGSN hardware maybe ?

I'm not sure I really understand your question. I will assume that you are not looking for a way to scam the system. Once upon a time someone developed a form of roaming called "Zebra". The idea was that a visitor could register his existing SIM with a local carrier for temporary roaming. After paying he would receive call credit and a local number. This would allow him to place and receive calls but it had very poor security because the SIM number was all that was used for authentication. The idea, as I remember, was that getting a temporary local account would not involve the cost of buying a SIM. I could be wrong on this. It's been a very long time. Maybe someone else recalls the details.