AT&T has announced that it has taken the steps needed so that Apple can begin allowing VoIP applications on the iPhone to run on its 3G network. Prior to the announcement, AT&T had blocked VoIP applications on its network, forcing applications such as Skype and Truphone to run over Wi-Fi only. The company previously allowed VoIP applications on other wireless devices, and has informed both Apple and the FCC of its decision. It will likely…