Why doesn't my iphone work without Wi-Fi?

I'm not sure if I pressed something but at the top left corner of my iPhone 5c it says no service by the Wi-Fi logo and when I'm not at home I can't send texts or do anything on my phone. How do I fix it

You need Wi-Fi thats why

Settings > Cellular >
Make sure this is on. If it is, switch if off, restart the phone, then turn back on. If that doesn't resolve it, then it's a carrier issue and you need to take it to them for a fix. Best luck.
http://support.apple.com/.../kb/ht4146

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