Switching from 3G to 4G, Internet not working.iPhone 4S?

I had an iPhone 3G with Rogers pay-as-you-go plan then I recently upgraded to a 4S. My data plan seems to work fine with making calls and texting, but the Internet won't work at all, just says it can't connect? Do I maybe need some sort of 4G plan?

The iphone isn't 4g compatible.

Why do you think you're on a 4G plan?

"My data plan seems to work fine with making calls and texting"

Actually, no. Texting and voice is not data. Data is data. Are you sure you're on any data plan? Your question doesn't really say this.

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