Hello Jason,
First of al checkout what is occupying space within your iphone. To know what’s taking up all your iPhone storage space, you open Settings, go to General > Usage, and wait for a while as your iOS device will calculate the storage used and which apps are using the most space. Usually, photos, videos, music, games are the biggest offenders.
When it comes to how to free up space on iPhone, many people generally delete photos, music, videos on their devices.
You can also try some tools like ccleaner to clear unwanted cache. Apart from you you can also use some tools as mentioned in this blog.
http://www.mytechlogy.com/IT-blogs/6780/how-to-free-up-space-on-iphoneipad/
Hope this helps!!
Jenny