unlock iphone

Hi guys, I need clarity. I bought an iphone 4 16 gig on the MTN network & was told that I cannot use it on Vodacom as it is locked (can only use MTN sim card). The only way around this is to have it unlocked & in doing so the warranty with MTN voids. I have not tried using my Vodacom sim card...

Source: http://www.dailytech.com/Customers+Cheer+Apple+Weeps+After+Getting+Defeated+by+iPhone+Unlocker+Yet+Again/article16708.htm

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