Can I get more Storage
Can I get more Storage for my iPhone
iPhone 5c, iOS 10
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you cannot expand the storage capacity of an iPhone.
Depending on what is taking up your space..
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support
If you have a bunch of pictures taking up your space, you could use iCloud Photos and a lower resolution image would be on your phone, thus saving some space (Optimize Storage option)
Set up and use iCloud Photos - Apple Support
If you need more than the free 5 GB: Buy more iCloud storage - Apple Support
Or you could back the photos up to a computer and remove them from your phone..
Transfer photos and videos from your iPhone, iPad, or iPod touch - Apple Support