STORAGE
why Does my phone system storage and other storage take up 14 of my GB OUT OF 16!!!! THIS STOPS ME FROM HAVING WHAT I NEED ON MY PHONE !!
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You bought a phone with only 16 GB storage which is the minimum available. The only way to gain more space is to delete photos, messages, apps, etc.. Be sure to save important photos and data to your computer or an external drive. Check these links...
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support
Clear Other storage on your iPhone or iPad - Apple Support
And this video...