Install iOS 10.3.1 If You Want to Free Up Some Space
The iOS 10.3 update delivered Apple's new file system dubbed APFS.
Apple first announced this major change back at WWDC 2016 though it took nearly a year for the company to implement the change.
APFS is optimized for Flash and SSD storages. It also delivers stronger encryption, space sharing, and copy-on write metadata. It also might free up a bunch of storage on your device.
Many iPhone and iPad users are noticing a sharp increase to the amount of internal storage space available on their device. You probably won't get an extra 30GB of storage space but you could reclaim 7GB+ of free space. We got about 2GB back on our iPhone 7.
If you're running out of internal space or you simply want to get some breathing room (it might help your device's performance), think about installing the iOS 10.3.1 update.