Forgot Blu-Ray, no phone os will play raw dvd. vob files either, optical media have particular structures, they are not just a simple digital media file, and this is totally ignoring the encryption that's involved. Optical disks whether physical or iso's have to be converted into a compatible format before it can be decoded and played on your device. Without getting into the decryption aspect after the disk has been ripped into a digital format you still have to convert it into a file format that is playable and formatted for your particular device. Once you have the digital source ripped then using something like Handbrake to convert it leaves you with a file that's finally playable on your phone.