Unlock iPhone 4 to use on South Africa carrier?

Search on Gumtree.co.za, you should find an unlocker there, here is a link for Durban a href="http://durban.gumtree.co.za/c-Stuff-for-Sale-cell-phones-mobile-telephones-Jailbreaking-and-unlocking-iPhones-and-iPads-W0QQAdIdZ272609336" rel="nofollow"http://durban.gumtree.co.za/c-Stuff-for-…/a