(Telecompaper) Telefonica has announced the launch of a web-based version of its Tu Go app in the UK and Argentina, with more markets, including Peru, Mexico and Brazil, to follow soon. The Tu Go app, which allows mobile customers to call and text over Wi-Fi networks, can now be accessed directly from within compatible web browsers via WebRTC functionality, removing the need to download an application for desktop use. The Tu Go for web interface allows up to five parallel conversations as well as the syncing of contacts from an existing Google account. Tu Go was first launched in 2013 in the UK with Argentina following last year. According to Telefonica, no other operator has launched a browser-based calling product using WebRTC technology.