My computer won't let me transfer camera photos to my mobile?

I have a nikon d3200 and i transferred the photos i captured to my laptop there good and they do appear but when i plugged my samsung mobile and i tried to transfer them is says that i won be able to view the photos then i tried to transfer them to my iPhone it doesn't work either

Did you copy and paste the images to the computer or did you try to drag and drop them? If the later, you may have simply created shortcuts to the images, with the shortcut referring back to the location on the camera.
You need to have the actual image files on that hard drive if you are going to copy and paste them to another device.

Are these RAW files or JPEG? If they are RAW then you will need software on your mobile device that can read the RAW files. Software built onto mobile devices does not read RAW files directly.