Why is it that my cellular data is not working

ebenezer ~ What model of iPhone is it?...

Settings > General > About > Model Name

And what version of iOS is it running?...

Settings > General > About > Software Version

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Can you give more information? What have you tried to do? Do you have a paid-up account with a carrier? Are you getting an error message? Please give as much detail as you can, then someone may be able to help you with your problem.