AT&T (NYSE: T) will no longer prevent internet voice apps from running on its 3G network, the WSJ reports. This means that iPhone users will now be able to download apps from internet voice providers like Skype and make calls using wi-fi networks. In blocking such services previously, AT&T said web-based phone services would clog up the telecom’s heavily used 3G network. Despite that worry, AT&T only blocked iPhone users from accessing internet phone usage, as other devices were free to use Skype and other similar services.

The reversal follows a Federal Communications Commission investigation into why Google (NSDQ: GOOG) Voice app was barred from Apple’s App Store.

AT&T’s decision to allow internet phone apps to run over its 3G network doesn’t automatically clear the way for Google Voice placement in the app store, as Apple (NSDQ: AAPL) said it made that determination on its own.

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• Update: AT&T Says It Did Not Block Google App; Apple Says It Acted Alone