Source: Slash Gear
While an official Skype client for the iPhone was a welcome announcement, the news that carriers’ and Apple’s Terms of Service prevented VoIP calls being made over 3G connections put a dampener on things. Now it seems that Skype running on handsets using iPhone OS 3.0 is able to use a 3G link for voice calls, in addition to WiFi.
As standard, only WiFi connections should be available for Skype calls. It’s unclear what in OS 3.0 is confusing the software, but right now people aren’t complaining.