The download limit is now 200MB for iPhones and iPads. The limit affects the maximum size of an app that can be downloaded over 3G or 4G networks.
The file size limit is designed to prevent iOS users from accidentally downloading a large app over cellular and using up all their data allowance or running up data charges. But as 9to5Mac notes, there's no way to opt out of the limit, which can be frustrating for users with unlimited data plans.
Apple officially increased the App Store cellular over-the-air download limit to 150 MB in September 2017.
Developers frequently work hard to keep their apps under the over-the-air download limit, as they believe going over that limit reduces the likelihood of spontaneous purchases.