Unlock 3330

[Nokyuser]

Hello,

I have a Nokia 3330 phone that I used in the UK while I was there. It is dualband 900 and 1800 and was locked to Vodaphone. I used the DCT3/DCT4 Unlock codes generator to unlock the phone and it produced two codes which seemed to work. However, when I install a 900 SIM card from my local provider, it does not register a signal on the screen from the provider. The screen does not say SIM card blocked as it did before it was unlocked. The instruction manual says that it is indeed dualband but does not say how to switch between 900 and 1800......Suggestions???