How do I clean up storage in my iPhone 6s?

I recently downloaded the most recent update (iOS 11) and I keep getting notifications that I need to upgrade my storage because I've used up all the free GB that my phone offered. I don't want to pay to expand storage, and I keep deleting photos and useless apps. How else can I make more room on my phone... show more I recently downloaded the most recent update (iOS 11) and I keep getting notifications that I need to upgrade my storage because I've used up all the free GB that my phone offered. I don't want to pay to expand storage, and I keep deleting photos and useless apps. How else can I make more room on my phone or is there another way I can expand my storage without paying for it?
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