What? To be on romaning is illegal? In israel there is some "virtual operators" that use practical operators antennas because they do not have enough antennas of themselves. For that reason i need to be in romaning most of the time, and i just want to know that in real time. That is the case.
changing the ESN isn't the same thing as roaming. changing the ESN spoofs your device as another. i'm not going to get into that.
a way easier solution, and legal, would be for you to just get a sim card for a network not even close to israel. then you'd always be roaming