Photos - discard old iPhone

Hi All,

I have recently purchased a new iPhone, and transferred contents (e.g. Photos) to the new device. Now I would like to sell the old device (iPhone 6s), and need your inputs about the ideal process.

Is it safe (without also deleting photos from other device), to do the following:

• Turn off Photos from iCloud (from the old device)
• Reset (erase all content & settings) from old device

Would this ensure that the photos and other content gets deleted from the older device, & is still available on the new phone (and iCloud) ?

Any ideas & suggestions would be appreciated.

Thanks,

Pranav