There are limits to what a government can do. Secrecy matters greatly in conspiracies, my suspicion is that it matters a whole deal less in revolutions. In those the regime has other priorities than chasing some random people who called that number, they are probably not even aware of it.

Many things people in Egypt currently do would probably lead to punishment if they did it all on their own, the mass protects them (and that’s one of the reasons why revolutions can work at all). Even if the regime decides to do something about it they would have to use blunt force and not surgical precision, there are just too many things happening at the same time to deal with all of them individually.

This obviously doesn’t make it absolutely certain that there will be no problems, I just think it’s rather unlikely.