Deleting photos

This is the thorough cleaning required.

What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support

felicity82 Said:

“Deleting photos: I gave my old iPhone 7 Plus to my partner. I erased the phone and set it back up with his own Apple ID. Problem is somehow he has all my photos on there and I can’t delete them. Please how can I fix this?”

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Has this been Associated to his Apple Account?

Apple devices can only be associated to one account every 90 days.

He’s probably associated this to his account. If so, then you’ll have to wait 90 days to re-associate it to your account, and then another 90 days to re-associate it to his Account.

Few Thoughts, if Associated to his Account...

A. Any Apps that Manage Photos?:

Remove any apps on the iPhone that he may have installed. They may be working with the photos in one manor or another at the moment.

B. Disable Photos in iCloud:

1. Go To: Settings
2. Tap: Apple ID (top item)
3. Tap: iCloud
4. Tap: Photos
5. Disable: iCould Photos

See if you can now delete these.

C. Use iCloud.com to Delete These:

Transfer these photos to your account by logging into iCloud.com. Then, upload these. Once uploaded, delete these from his iCloud account and the iPhone itself.

felicity82 wrote:

and me sharing my storage plan with him he now has my photos.

I assume this means you somehow share iCloud storage (as part of Family Sharing, perhaps) and you store the photos in iCloud Photos. That would explain it.