The Defence Ministry has launched an iPhone app to make the normally secretive People's Liberation Army less so - but users will have to 'jailbreak' their iPhone first. A ministry spokesman said the app had been developed to answer domestic and overseas criticism of the military's lack of transparency. But there is a catch: the app is not available at the official Apple Store. Users can download it only on the ministry's website, and they will have to 'jailbreak' their iPhones - hack into the operating system - before installing it. The app features 15 channels, providing information including breaking military news, announcements, leadership activities and in-depth opinion. It is not clear why the ministry did not offer the product (pictured) through Apple. Apple long argued that 'jailbreaking' amounts to copyright infringement. It was not until last July that American federal regulators declared it legal. A software engineer in Beijing said his company had produced many iPhone apps for mainland clients, but had never had a request from a respectable client to produce an app that can be downloaded only by 'jailbreaking'. 'If the military wants to improve its public image with the app, it should offer it through the Apple Store, which is a common practice by governments around the world,' he said, not giving his name.