Why won't My sprint iPhone 4 won't connect to 3G?

Before you say call them I already have ok. Today I had an upgrade but my aunt used it for her phone since I'm on her plan. It went good but then won't connect to 3G after that we called and they said something went wrong but nothing did so I'm wondering is there anything i could possibly do to fix it or should I call the place that did it? Or should I just call sprint or apple? Please help I have to use my phone a lot in places that don't have Wi-Fi.

Try going to settings, general, reset, reset network settings. This will only reset the network, it will not erase everything on your phone. After you click reset network settings, the phone will re-boot. Try to use the internet again after the phone re-boots. If that doesn't work, try calling your local sprint store and they should be able to assist you.

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