Rebranding...by definition could be a number of things:
1) When the physical branding is missing, and is replaced.
2) When the vendor ID of a device is that of RIM or another carrier, and changed.
3) When the boot up splash screen is that of RIM or another carrier, and changed.
4) When the default theme is that of another carrier, and changed.
End result is my friend carried the phone to a local blackberry repair store and they told her the phone got locked, so they are going to rebrand the phone and then unlock it again so it could work on our network.