IMessage won't activate and can't send pictures on h2o wireless?

I have an iPhone 4S on ios 7 and just activated it with h2o wireless. I can call go on the internet and send regular text messages but it won't let me activate iMessage or send pictures.

Is your UDID registered? A lot of people have reported problems like this when they run iOS 7 without registering their device's UDID with a developer account through a site like http://www.udid.in/.It's $5, and then you also don't have to worry about Apple disabling your device for running unreleased software.

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