Why won't cellular data actually connect?

My phones cellular data won't connect to LTE. And I have no idea how to make it work, or how to troubleshoot the problem. I have cellular data, LTE, and data roaming all switched on. But no connection.
My phone is the iPhone 5C if that helps. Thanks!
Ps: I'm permitted to access internet in my plan, but I can't.

Reboot phone… Work now?

if not… Do you have signal? If not, gee i wonder why you can't get on the internet. Lmao!

if you do have signal, can make calls and text… But no data… Then you have a data outage… Call your carrier and report it…

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