Why isn't my iPhone 4S working?

I just got an iPhone 4S on virgin mobile. The phone only works when it is connected to Wi-Fi. When i'm connected to 3G i have 3 bars and the 3G showing it says I have no service and nothing will work! Also I have Wi-Fi in my house and the phone can't even pick it up sometimes. What should I do? Is there any way I can fix this mess!

Try to reset the whole iphone and see if that works

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