Actually make sure that the phone is locked first by putting a non 48 SIM into it.
It almost certainly is but if it happens not to be then you don't have to do anything!
However if it is locked...
Codes for unlocking are generally not transferrable - as you found out here.
You need to get the new 5c unlocked somewhere - ideally officially by Vodafone (which may be pricey?) or failing that unofficially (e.g. online or in a phone store).
If you do get it unlocked unofficially then be be clear on how they do this as some methods can cause problems with future updates, phone functionality etc.
If in doubt try to find somebody independent who knows about iPhones and unlocking to advise you first.
Hope this helps.
