The Sky Go app has proven to be very popular for both iOS devices and Android smartphones. A new update should make it even popular.The original app offers access to a number of Sky channels on the move, including all the Sky Sports channels, all 11 Sky Movies channels, Sky Atlantic, Sky 1, Sky Living, Sky Arts 1 and Sky News, whether you are watching via Wi-Fi or 3G. But now, the service has gone on-demand too. Both the Android and iOS apps now offer catch-up on the latest Sky shows, some complete series, others with just the last few episodes, with the ability to browse shows by category or as an A-Z listing.So if you are a fan of Sky1, Sky Living, Sky Atlantic and Sky Arts but don't have the time to watch in the evening, you can always do a sneaky catch up in your lunch hour. For free too, if you have the right subscription package.