On your iPhone how do you free up some capacity?

I have a 16gb iPhone and it says 4.2% is other… What does other consist of and how do I delete some of it?

Hold the app icon and it will show an x and click the x and select delete.

The other is most likely app updates and app capacity.

Other is part of the software itself I think, so Deleting any of it would mess up your phone. You could try deleting apps that you don't use or photos if you want space for something else.