My 3G doesn't work on iPhone?

I can use Internet, Facebook, twitter etc at home using the Wi-Fi but whenever I leave the house and try and, for example, search something on google, it come up with a message and a grey compass basically saying to reconnect the Internet.
What do I do to fix this?

Do you have a internet data? If yes, what service is it?
And make sure the cellular data is turned on in your iPhone's settings.

You'd have to talk to your carrier about that since the 3G is their responsibility.

Help My Iphone was perfectly working. 4 days ago this problem occurs

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