How to switch from h2o wireless to straight talk?

I have an iPhone 4S. It isn't unlocked so I can't get pictures. How can I switch from h20 to straight talk? Is it as simple as switching the sim and activating it since my apn settings are correct for the straight talk network?

Unlocked the iphone… Then go to www.straighttalkbyop.com… Read english and follow kindergarden instructions…

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