got iPhone 3gs unlocked by o2 but bought SIM on holiday and can't use It!

[Anonymous]

Everywhere seems to indicate I need to complete the unlock and enable the new SIM using iTunes. But I don't have access to iTunes on holiday!,

Any alternative to using itunes?. I currently have a Vodaphone NZ SIM I want use!,

[MI5]

I think the 4s can be unlocked over a wifi connection but not sure about the 3gs.

[Anonymous · Accepted solution]

Pretty sure the 3GS needs to be done via iTunes 

[ComaChameleon]

When I exchanged my 3GS for a new on in the Apple store the Genius told me since the new iOS you can just put the other sim into the phone and start using it (just like I did with my o2-sim in uk last month). Just be sure to have the latest iOS