Why is my 3G on my iphone 4 not Working?

My 3G On my iphone only works sometimes when I"m out side but the thing I don't get is that it only works sometimes and other days it doesn't! It's says I have bars and 3G but when I try to open my Wi-Fi apps it says no connection! Any help?

Should talk to your carrier about that

Hi if you have a bt land line you can use their bt Wi-Fi app which will provide you a connection in most places

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