Why can't I use cellular data on my iPhone 5c?

I've had my phone for a while now and since yesterday I have not been able to use my mobile internet, I tried to update to 7.0.4 and I have not been able to connect still.

Contact service provider mine is running smoothly

Happened to me, the jurkoffs at the mobile company made a mistake and entered my phones data wrong in this system, they said my SIM was allowed access to a radio spectrum it couldn't use! Just go back and let them, they'll fix it.

Needs more time