If you have an iPhone, you can use both a 3g network and Wifi to access all of your favorite apps such as I-tunes, etc. I have worked for cell phone companies, and best buy, as well as using an iPhone myself. I know from experience that you shouldn't have any problems with your iPhone.
Both iTunes and the App Store work on 3G (not available on the original iPhone), EDGE and Wi-Fi. The only restriction is that you can't download certain large files (such as apps bigger than 10MB) over 3G or EDGE. You have to use Wi-Fi.
Most Internet-enabled apps work both on cell networks and Wi-Fi. A few streaming video apps, such as SlingPlayer, are Wi-Fi only, however.
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