I have a mobile html page which contains images. I want to create a button or a link which is used for a download of an image. The image should then be saved to the users mobile
The force-download for files usually opened by the browser can be done with the .htaccess file in the directory where your images are.
It was replied previously here:
Force a file or image to download using .htaccess
I haven't tested so don't know if it will work with mobile browsers though.