Perhaps a little later than expected, the Sky Go apps for iPhone and iPad have launched, meaning more TV on the go, especially if you are a sports fan.You see, the mobile apps differ than the computer-based service, with less channels and more of a bias for sport. In principle, it's the same, with the apps allowing you to watch and record Sky TV on your iPhone or iPad, pretty much wherever you are, connection permitting. Watch channels live, pause and rewind 'live' TV and check the EPG for what's coming up. All of that on up to two (registered) devices, so if you have both an iPhone and iPad, it's good to go on both.However, content is the difference. Tablets and phones have fewer channels than computers. But all the Sky Sports channels are accessible, as are ESPN and Sky News, with access to Premiere, Showcase, Action and Family Sky Movie channels too.Sounding good? It should sound even better if you are a Sky customer, as the service, like the app, is free. If you're not, the price is between £15 and £40 per month, depending on what you opt for. At that price, you might as well get the dish to get the service free – which might just be Sky's plan.