Delete Photos and Videos You Don’t Want Anymore
Granted, this might take a while if you have a lot of pictures or videos, but manually going over your albums and getting rid of the photos you don’t want can free up a lot of space on your iPhone.
To delete multiple pictures at once, you can go to the Library tab in the Photos app and then tap on Select in the top right corner. Then tap on any pictures you want to get rid of. Tap the trash can icon in the bottom right corner and then select Delete Photo.
Just keep in mind that deleted photos go into a Recently Deleted folder for 30 days, so if you’re in a hurry to free up space, you should also select the Albums tab, scroll down and open Recently Deleted, and then delete them again from there.