There is a new Apple operating system in town, but iOS 6.1 is only likely to change the mobile lives of a section of Apple customers.The big change here is increased support for LTE networks, with Apple adding 36 additional iPhone carriers and 23 additional iPad carriers throughout the world. Unfortunately for us Brits, the market is still pretty closed over here, with the 4G auction only just underway. We'll have to wait until summer to see what Apple has in store for future 4G networks in the UK.Apple is obviously pleased with more LTE compatibility: 'iOS 6 is the world's most advanced mobile operating system, and with nearly 300 million iPhone, iPad and iPod touch devices on iOS 6 in just five months, it may be the most popular new version of an OS in history,' said Philip Schiller, Apple's senior vice president of Worldwide Marketing. 'iOS 6.1 brings LTE support to more markets around the world, so even more users can enjoy ultrafast Safari browsing, FaceTime video calls, iCloud services, and iTunes and App Store downloads.'That's not the only update though. The new version of iOS 6 features increased language support for Siri, the option for iTunes Match subscribers to download individual songs from iCloud rather than full albums or playlists, and if you happen to be in the US, the option to purchase movie tickets through Fandango with Siri.That last feature might not interest you much, but it's perhaps an indication of where Siri is going for us in the UK too. Ask the question and book the ticket. No hands required. Trust us, it'll be everywhere next year.But more relevant right now is this 6.1 update, which is available to download today, weighing in at 86.7MB in total.