While rooting, hacking & flashing all these sound very cool to do, you might consider the possibility to PERMANENTLY DAMAGE your Device while doing so. There have been Numerous issue’s that have been reported with the Android Market HOT CAKE’S the SAMSUNG GALAXY Devices. Since the very first member of the Galaxy S family there have been issues related to IMEI a.k.a Network Registration Failure.
This is caused by flashing of the Device, may it be a stock firmware also, the backup of the EFS folder has been know as a suggestion but in some cases even after restoring the IMEI you might still mess up your Serial number. This will leave you with the only option to get it fixed from Service Center or a Third-Party mobile repairer setting you back a decent amount. So be very careful before you decide to take your SAMSUNG Galaxy Devices for a Spin in the Root Fun-land