Agreed, Vodafone and Telecom flash "their" phones with their own firmware which contain their network settings and logos. I have not tried it with the nokia's myself but you should be able to get the latest generic firmware from the nokia.co.nz site via the Nokia Updater Software.
p.s. I have just had my first experience with a parallel imported phone, it comes with the generic firmware from the factory (nokia) so any updates nokia make i can put straight on. Whereas if it was a vodafone or telecom phone i would have to wait until they updated the new firmware with their pictures etc
The 1680 is NOT software upgradeable via Nokia Software updater.
Most repair places (this does not include Nokia own care Centres because they will not debrand your phone) will charge you at least $50
Other than removing the VF Live links and screen splashes it is not going to increase the performance of the phone and yoou will need to reload the VFNZ settings so you can send and receive texts, MMS etc.
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