I am on Vodafone, have been since 2007. My handset is a proper vodafone handset purchased from JB HiFi not a parallel import. Every so often it looses its signal and displays emergency calls only, I do a lot of driving and seems to happen regularly and mostly I noticed it happening when the phone has been in a weak signal area or no signal at all. When moved back into strong signal it just never picks up the signal again. Very annoying and I have lost a bit of work because I rely on my phone to receive jobs, I have to reboot to get signal again and then have all these voice messages come in and free who called txt's. Im ready just to throw this phone away and change back to my old 2005 nokia with green screen, that old phone never had any problems and had been dropped countless times and generally given a hard time and still worked fine.
model : GT-I9000
firmware version: 2.3.3