Cellular Data Network Iphone

So i have an Iphone and my step dad turned off the cellular data network. I can't get internet without Wi-Fi. And it is getting really ignoring. So how do i turn back on the 3G internet so i can connect places without Wi-Fi.

I would assume he turned off the 3G capability from your iPhone since its a bit hard to have your provider turn off 3G. (Cell service providers force iPhones to have data plans on their network unless you are with a prepaid plan)

If this is the case, go to Settings>General>Cellular>Cellular Data>ON

and turn on anything else you want to have on as well, including Data Roaming.