Why can't I connect to my internet carrier on my iPhone?

I have an iPhone 4s and before, I had no troubles connecting to my internet carrier and using the internet. But for some reason I can't use it anymore and each time I go to Safari and try to use it, a small sign comes up saying;
'Could not active cellular data network
PDP authentication failure'
and then Safari just says I can't use the internet because my iPhone isn't connected to the network.
Help, please. My brother doesn't allow me to use the home's internet Wi-Fi on my phone so the carrier is all I can use, and it's not working.

Have you tried rebooting your device?

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