Can't get internet on iphone 5 without Wi-Fi. I have unlimited plan?

Can't get internet on iphone 5 without Wi-Fi. I have unlimited plan?

Depending on your carrier you need to have at least 3G (AT&T) or 4G (all) to receive data (internet).

Alternatively, if you're Wi-Fi is on and you are connected to a router that is disconnected from the internet, the phone won't know and will continue to try over Wi-Fi instead of provider's service. In this case, simply turn off Wi-Fi via Settings.