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The next competition in technology is your face – anywhere, anytime. As the cameras and screens of smartphones and tablets improve, and as wireless networks offer higher bandwidth, more companies are getting into the business of enabling mobile video calls. The details vary from one service to the next, but the experiences are similar: from anywhere in the world with a modern wireless network, a smartphone’s screen fills with the face of a friend or relative. The quality is about the same jerky-but-functional level as most desktop video. Sound is not always perfectly synced with the image, but it is very close. The calls start and end the same way, by pressing a button on the screen. Mobile video calling has risen so quickly that industry analysts have not yet compiled exact numbers. But along the way, it is creating new business models, new stresses on mobile networks and even new rules of etiquette. “All the communications – social messages, calls, texts and vide...