Pokemon Go had more downloads from the iTunes App Store in its first week than any other app

"iPhone is so popular and mature the narrative has been switching from how to build up the device as a platform to all the platforms that can be built on the device — and the iOS software that powers it.
Look no further than Pokemon Go, which Apple recently told me had set a new App Store record, scoring more downloads in its first week than any other app in store history."

Source:  iMore, 22nd July 2016