How to always have internet on Iphone?

I connecte my Iphone 4 with NET10. I got the 50.00 plan which includes unlimited everything. But every time I go to the Safari I HAVE to connect it to a Wi-Fi.Am I always gonna have to do that? Connect it to a Wi-Fi? I try going on the internet at school and a message comes up saying I'm not connected to the Internet. When I get home I connect the Wi-Fi with my network. What do I need to do so I can always have internet and not have to connect to a network every time or always stay connected to 1?

Lol don't delete this answer i have the same problem