AT&T recently blocked all the VoIP calls generating from the cellphones to protect its policies, but after revising some conditions, AT&T has allowed applications, such as Skype and Google Talk to make unlimited voice calls using AT&T 3G Network to anywhere they want to. Allowing this has put AT&T directly in competition with Skype regarding Local and International call rates.

Before this, AT&T iPhone customers and other users using smartphones were unable to use Skype for voice calls on their mobile, and its use was limited to WiFi connections only. Enabling calls on 3G would let most of the people to switch to Skype, and make free calls over the same network, which may seriously dent the revenue of AT&T if it becomes a trend.

According to PC World,

Somewhat coincidentally–if you believe in such things–earlier in the day, Google and Verizon held a joint press conference to announce their new partnership, in which the two companies stressed network openness.

The decision today does not apparently affect other applications that suffer from similar restrictions, such as the iPhone version of SlingPlayer Mobile, which allows users to stream video from their home devices only over Wi-Fi connections. Nor does it affect the contentious Google Voice service, which uses the standard telephone functions of the cellular network to route phone calls to and from users.