Apple has quietly increased its cellular network cap for App Store downloads to 100MB, double of the previous 50MB limit, as noted by a MacRumors reader. Normally, for apps over 50MB, were prompted with a notification to connect to Wi-Fi in order to continue the download. That has all changed.
Want to save your precious data plan? Turn off the use of cellular data for automatic downloads:
Settings > iTunes & App Store > Automatic Downloads > Toggle OFF ‘Use Cellular Data’