Iphone ios 6.1.1 internet problem?

I updates my iphone to the 6.1.1 and suddenly the internet data services is not working anymore and the mobile provider sent me a message that the problem is from the device itself, not the carrier. Can anyone help me fix this problem?

Go and reset your network settings, this should fix the problem.

If that doesn't do it, backup your device with iTunes then reset it.

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