Why iPhone 6s storage is being mostly taken up by iOS and other system data?

Hello,

Both numbers seem about normal. With only 16GB on you phone, your options are limited. Your short term option is to routinely monitor things that can be deleted:

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

For the longer term, a phone will more storage would be helpful.

Good luck.

Actually, I just discovered Twitter was taking up 98% of my storage.

Apple Podcast was the next highest offender.

I deleted the Twitter App completely —

My storage freed up almost 100%!

Then I re-downloaded it & my storage is still wide open —

I went from FULL down to 27GB!!!!

Twitter was the offender for my storage problem

Hello stepharmd,

Thanks for the update :-)