5 Clean Up Your Storage
Generally, storage space doesn’t have much of an impact on your iPhone’s daily performance. But there is one important exception: when you have less than 1 gigabyte of storage left on your iPhone.
Go through and delete apps, iMessage threads, photos, media and other data that you don’t use. You can also boost memory and storage by deleting your Safari cookies and cache. Just go to Settings > Safari and tap on Clear History and Website Data.