It's also called a SIM lock or network lock. Basically it's telling you that your phone will only work on Vodafone until you provide it with the correct code. You can get this from Vodafone by calling their customer service and asking about unlocking your phone but they might charge you for it.
There are also online services offering to unlock phones but I've never had to use one so I can't really offer advice on that. Your best bet is to call Vodafone and see what they have to say.
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