You may not have been aware of this, but recent versions of iOS actually had a loophole that allowed industrious folks to use emulators on iPhones and iPads without jailbreaking the device. Cool, huh? It won't be cool for much longer. Apple intends to squash this loophole with the iOS 8.1 update.
According to the team behind GBA4iOS, Apple's next update will stop the 'date trick', which allows users to download unauthorised apps through Safari, meaning that the ability to play old school games through emulators will be gone for the foreseeable future.
The 'date trick' involved rolling back the date on your iPad or iPhone, tricking the device into allowing certain pieces of software to be installed. It's no surprise, really, that Apple would fix such a simple hack. I can't imagine that any publisher would be too happy with people downloading ROM after ROM after ROM, even if — technically — ROMs are legal if the user owns the actual video games. Because let's be real here — this sort of thing really does subvert, for example, Nintendo's Virtual Console strategy.
Time to move to Android everyone! The emulator paradise!
(Actually, in my humble opinion, emulators on touch screen devices are pretty terrible!)