O2 Launches Data-based Free Calls App 'Tu Me' writes: "Telefonica, the Spanish mobile network operator that owns O2, has launched a new app that aims to compete with data-based communications services such as WhatsApp, Skype and Viber. Tu Me allows you to make calls, send messages, including picture messages, and share your location with friends and family over the internet. Of course this means that it requires a data connection such as 3G and WiFi at all times to work."

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