3G or Wi-Fi, what's best?
If you are using WiFi there isn’t usually a limit to how much data you use. But if you have a 3G contract it’s a bit like calls and texts allowance on your phone. Every time you do something online it eats into your data allowance and you can quickly use up your credit.
All the big network providers offer a range of tariffs with a choice of data limits and the right one for you depends on what you want to do online.(from BBC webwise)
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