iOS
Save a copy ⤼ to your photo roll on your device. Then to set wallpaper follow this path:
Settings > Wallpaper > Choose a New Wallpaper > All Photos > (it should be the last photo added) > Click it > BAM! Done… ‘Set’ if you’re ready > Unless you decide that one wasn’t the one you wanted, then hit ‘Cancel’ and start over.
Then chose the Lock, Home, or Both. If you start with the correct format for your device you shouldn’t have to scale or crop it.
ANDROIDS
Beats me! lol. Sorry. I’ll look into it, one day…
PRO TIP
The designs with more variation are better for the Lock screen and the vertical stripes are better for the Home screen. But it’s your phone, not mine.