I deleted photostream photos on my iPhone 6 . How do I recover them?

If it was in the Photo Stream there would still be a copy of it in the Camera Roll

If not then check the 2nd link, you might be using that.

My Photo Stream FAQ

http://support.apple.com/kb/HT4486

iCloud Photo Library beta FAQ

http://support.apple.com/en-is/HT6378

Best of luck

damaag wrote:

If it was in the Photo Stream there would still be a copy of it in the Camera Roll

If not then check the 2nd link, you might be using that.

My Photo Stream FAQ

http://support.apple.com/kb/HT4486

iCloud Photo Library beta FAQ

http://support.apple.com/en-is/HT6378

Best of luck

There is a slight chance that those images may be cached in icloud backup, if they were in camera roll or library OP would not be here would he, T.