My iPhone 6s 16gb is low on space

Here are some helpful articles that can guide you on how to free up storage space on your phone.

How to check the storage on your iPhone, iPad, and iPod touch

How to check the storage on your iPhone, iPad, and iPod touch - Apple Support

Manage your photo and video storage

Manage your photo and video storage - Apple Support

Clear Other storage on your iPhone or iPad

Clear Other storage on your iPhone or iPad - Apple Support

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See: How to check the storage on your iPhone, iPad, and iPod touch - Apple Support.

Jack

slade96 wrote:

i don't have much stuff but the system data takes up 6gb

That's normal behavior.