Thanks for reply.
which is the best option in these options.
Use Custom Field/Key, Use Featured Post/Thumbnail (WordPress 3.0 + feature), Consider Images attached to the post, Order of the Image attachment to pick, Scan images from the post, in case there is no attached image to the post.
I do not get that posts are correctly displayed with photos from mobile
if you want to see my web
https://www.rockinspain.es