Posting to a thread on mobile is easy. Upload to photo hosting site (photobucket, flickr, ect), you can even use their app for uploading. Get the direct link for the image (ending in .jpg, .png, or whatever your phone saves photos as), then use IMG tags to post into thread - [ img ]photo-url-here.jpg[ / img ] (don't put in the spaces within to brackets...that's just so you can see them in the thread).