AT&T reversed course on Tuesday and said that it would no longer prevent iPhone customers from using Voice over IP protocol (VoIP) services that bypass its own voice network.

Prior to this, the only way to use Skype's VoIP telephony service was to use a Wi-Fi network, which could be spotty or unreliable. In announcing the news, AT&T (NYSE: T) noted it has offered a variety of other wireless devices that enable VoIP applications on its 2G and 3G networks for other phones, like Windows Mobile devices. AT&T this afternoon informed Apple (NASDAQ: AAPL) and the FCC of its decision.

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