Can i unlock a second hand iphone from vodafone network?

Just like the title. I want to buy a second hand iPhone and be able to use it on a different network carrier. I know there are a lot of programs, chips etc you can use to unblock the network but say for example if the current owner of the phone has a recently purchased contract on the phone for 18 months, can it be unlocked without waiting them 18 month contract permanency?

You can unlock this by a gevey sim if it is iphone 4 with baseband 4.10 or lower and iphone 4s. If it baseband 4.11 or higher then you have factory unlock.

Yeah you can unlock any iphone for any network jut go to http://iphoneunlocksoftwarefree.com

You can't.

Yes, you can unlock your second hand iphone simply by using remote unlocking service. After unlock by using remote unlocking service, you need to update your iTunes. Thats all. You can get remote unlocking service for your iphone at http://www.theunlockarena.com/apple-iphone/rs13wp9/