One of the best built-in features of the iPhone 4 is FaceTime, the video calling feature that lets you see who you are talking to by using the cameras on both phones. But it only works over WiFi and if both callers own an iPhone 4. Perhaps those limitations are why an app called Tango is the seventh most popular social networking app right now (iTunes link).
Tango lets you make video calls not just on iPhones but also on Android phones, and it works over 3G data networks as well. It works
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