To play DVD on iPhone 6, you need to make the physical DVD copy to digital. Do a search on Google and you will find a lot of DVD copy software. Choose one to get started/ Here Leawo DVD Copy will be taken as example.
Step 1: Download and install Leawo DVD Copy on your computer.
Step 2: Launch the software and open DVD Copy module.
Step 3: Import source DVD to the program.
Step 4: Choose output format and make output settings.
Step 5: Set output directory and start to copy.
Step 6: Transfer the output digital file to your iPhone.