This means that if your device is not interop-unlocked (giving access to lower-level drivers with a registry flag), you won’t be able to do so because the current methods are tied specifically to the GPRS profile switching capability of the app. To revert back to a version of the Diagnostics app that works with the *#9908# command, uninstall the 0201 release and type ##634# in the dialer once again. NOTE: If you updated your Samsung device to 8107, let me know what model you have and whether the command mentioned above works in the diagnostics app on your build (given that the app is 0201).