This will be great, especially if the app talked about in the other threads iCall is as good as many are hoping. That or a Skype app. Either way, for those that travel international, being to use a VoIP service would be wonderful.
On Apple's feedback page, I requested a quick "Do Not Disturb" switch on the original iPhone. This would allow me to surf in peace and listen to the iPod portion without getting hit with SMS pop-ups and interruptions with incoming calls - it would just show the red numerical badge in Visual Voicemail, Recent Calls, and SMS. I suppose this is the closest I can get to that feature now.
With the advent of flights allowing their users to turn on their Wi-fi devices, it has been said that the iPhone will include a setting within Airplane mode for us to turn on Wi-fi. The news could not make me happier. While traveling abroad, it becomes very useful.