Changing iphone 4s from vodafone to giffgaff?

My brother has iphone 4s he is trying to change from vodafone to giffgaff and his phone is locked. We don't really know what to do next to get it on giffgaff: S. We have gone through all the stages and stuff on the giffgaff website and we have also been to vodafone shop… But nothing
can anyone help please?

Simply purchase a Vodafone iPhone unlock.
http://cgi.ebay.co.uk/...RK:MESE:IT

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