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If you're not using iCloud photo library, then you can import them using the instructions posted by roaming gnome. If you are, then you'll need to log in to iCloud.com on your Mac and download them individually, then drag them to the photos app.
Also, if you have a 16GB phone, then it's probably best that you don't use iCloud photo library.
If you need to free up free data storage space on an iPad/iDevice, you need to start by backing up your iPhone to either Apple's iCloud or by connecting your iDevice to a computer running the latest iTunes.
Then delete any installed apps that you no longer use or use infrequently enough that they aren't missed (you can always reinstalled any purchased or free apps at some time later, as you need them).
Thin out/delete any music/videos/movies/TV shows/images/eBooks/eMagazine/iBooks/audio books/Documents/PDFs, etc.
Delete any old saved emails that maybe saved to your iPhone
To permanently delete photos/images off of your iDevice go into the Photos app and find the Recently Deleted folder/album and permanently delete any photos/images stored in that folder/album.
Also, you can check to see what stuff is eating up all your valuable data storage space by going into the Settings App,,General Settings Panel, in the right hand column, tap the iPhone storage usage panel, in the top Storage Panel, tap the Manage Storage panel, wait for a list of apps to generate that will tell you how much space each app is taking up on your iDevice.
Then do a hard reset of your iPhone by holding down both the Home and sleep/wake buttons simultaneously until your iPad goes to black and restarts with Apple logo, then release the buttons.
Good Luck to You!
Question: How can I free up space in my iPhone?