Why doesn't my iphone 4 have Wi-Fi away from home?

When i'm at home my iphone 4 has Wi-Fi because i'm connected to a network, but away from home i should still have 3G but i don't. It will not let me use any internet when i'm away from home.

Is the 3G (internet access ) enabled?

Wi-Fi is only when you are at home or near a Wi-Fi hotspot for some users.

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