Why isn't the Internet on my iPhone 5 working?

I just got the iPhone 5 with straight talk. If I have an unlimited data plan why is it that my internet only works when connected to Wi-Fi and not off of my network

With straight talk, it can take a couple of days to get data going, but they also screw up a lot on setting them up. I suggest you call straight talk:
Phone at: 1-877-430-CELL (2355)
Sim Customers: (855) 222-CELL (2355)
Phone at: 1-800-299-7784
It took them 3 tries to get my iphone 4s data working, not the most reliable but cheap.

On your phone go to settings,> general,> cellular,> and turn on cellular data

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