5.1 which was released in March of 2012, Apple raised the limit to 50MB. Some expected Apple to raise the limit again with the introduction of the iPhone 5, which was the first LTE-capable iPhone, but instead Apple has waited until now to raise the limit again.For a long time, the over-the-air download limit on iOS was just 20MB. Then with iOS
Of course, iOS developers have been having more and more trouble keeping down app sizes because apps need to include assets for Apple's high-res Retina displays. Another issue could also be the move to a 64-bit processor with the iPhone 5s, because 64-bit apps are larger than their 32-bit cousins. For anything over 100MB you'll still need to be on Wi-Fi.