Apple’s calculator doesn’t have history option and there is no File manager in iPhone
Improve calculator efficiency and file manager option
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An iPhone running iOS 11 has the Files App which is the closest you'll get to a file manager.
Use the Files app on your iPhone, iPad, and iPod touch - Apple Support
Due to the nature of iOS, there really is no File System for a file manager to access.
This is by design, to make the iPhone more secure so its unlikely to change, however you are free to give Apple Feedback about it: Feedback - iPhone - Apple
