How to unlock Virgin Mobile iPhone?

I have the iPhone 4S on Virgin Mobile's service. I was wondering if there was a way to "unlock" the service so I can put it on another service such as Straight Talk or T-Mobile. I'm kinda fed up with Virgin Mobile's slow 3G.

Hi, you can unlock an iPhone 4S easily by using the Remote Unlocking Service. You can get this service at low cost from Unlock-Zone.com with easy step by step unlocking instructions. After unlocking it, you can use freely any GSM network Sim card.

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