SE Gen 1 and iOS 15.6

thelowest1 Said:

"SE Gen 1 and iOS 15.6: I have 16GB on my phone, of which the current iOS takes up 10GB of. I want to upgrade to 15.6, but can’t delete enough to allow it... any ideas? Can I delete the current iOS?"

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Try Removing Data from the iPhone itself...

Troubleshooting iPhone Storage:

Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud plan. Learn More here: What's the Difference Between Device Storage and iCloud Storage? Apple Support. 

So, what to do:

Clear Space:

Try clearing internal storage though use of the following:

What Space to Clear:

A. Clear Temporary Internet Files:

Clear your Temporary Internet Files(Cookies & Cache) of Safari:

• Cookies perform remembrance of certain site-entered data.
• Cache keeps a snapshot of the last time you visited a site.
• Go Here: Clear the History and Cookies from Safari on your iPhone, iPad, or iPod Touch - Apple Support

And...

B. Clean TV and Music Libraries:

Remove all unneeded files from your TV and Music Libraries. Full-Movies take up 2-4GB typically, and a bunch of those would take up a load of storage, ideally. So, if you have any movies that are not needed, then delete them.

And...

C. "Other" being the Culprit:

Use my User Tip:The storage named "Other"(or "System Data") is a grey bar seen in storage. How to Clear "Other" in your iPhone's Storage - Use Backup - User Tip

You could also try upgrading using a computer. It requires less free space on your phone.

Update using your computer -

Update iOS on iPhone - Apple Support