Hello all , i had jailbroken ny sons iphone 3g phone running 4.2.1 with redsnow , my son then had his phone stolen from school so i phoned the service provider to block his phone , he was given it back today and it is back on factory settings and obviously cannot make any calls , his service provider is sending a sim with the same number same credit etc as i said its back to factory settings with nothing on it at all its still running 4.2.1 can i jailbreak as before with redsnow as per normal ?