Basically an app that does EVERYTHING via WiFi/3G/4G. Voice and text and video (maybe). A way to completely replace having to have an actual number and voice service, which is a huge issue for travelers. Cell voice service and traditional phone technology is just too fragmented. Data levels the playing field for everyone, no matter where you are. I know that Skype does all this but Skype sucks for a number of reasons. 1. It needs to constantly be logged in and running on the phone to do anything. Push notifications aren't used. Dumb. 2. The integration with the phone's stock dialers/messengers are non-existent. 3. The app itself sucks. I can't even copy and paste numbers into the Skype dialer. I can't put a cursor in the middle of a number to edit a typo. I have to delete all the proceeding digits to get to the digit that I want to edit. Viber is great but is only for mobile phones and can't call to landlines. Google Voice is tied to a mobile number and can't be used for international numbers. Anything else?