How to recover deleted photos on iPhone?

They will remain in your Recently Deleted folder for 30 days. If it has been longer than that time or you also deleted the photo from that folder, then they are gone and you would have needed to save them in another location on your own. If you did not delete them from the Recently Deleted folder and it has been less than 30 days, then you will find them easily by using this link:

If you're missing photos or videos in the Photos app - Apple Support

Unless you turned off Recently Deleted, which you probably did not.

Step1— wrote:

Unless you turned off Recently Deleted, which you probably did not.

???

Not sure what you are referring too, can you explain?