My iPhone 5c internet will only work with Wi-Fi now?

When I first got it I could get on the internet anywhere and now I can't. I have to be connected to Wi-Fi. My brother who is on the same plan as me had to get a new SIM card a while back bit I'm not sure why. If I turn off Wi-Fi and try the internet it says something like " could not activate cellular data" help?

Go to settings -cellular-use on safari

That was a great non-answer

That was a great non-answer

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