IPhone internet won't work without Wi-Fi?

Okay so all of a sudden (yesterday) my iPhone 3GS internet won't work unless i'm using Wi-Fi. It does, however, let me in Wi-Fi zones. So my 3g is there (full signal), I have at least a 100 gb (I think it's gb? Hmm) of internet left so it's not that the internet has run out. Help? I've already turned it on and off, put airplane mode on and off, hard reset it, so please help!

Added (1). I said I didn't know whether it was gb, so stop trying to be clever. My point is that I still have internet left. Don't bother replying with a sarcastic comment.

100gb would cost approximately £600-£700 a month…

Did you contact your carrier? Why do you think anyone hear can answer carrier questions?

Turn on safari That just fixed my problem.

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