Welcome to Android Central! So let me see if I have this right--you want to access photos on your phone's Camera Roll from your tablet? If the photos are only locally stored on the phone, then the tablet won't be able to see them. You'd have to upload those photos on your phone to a cloud service like Google+ Photos first. You would then be able to see those photos on your tablet or any other device or computer by using the Photos app (on an Android device) or by going to your Google+ Photos site (on a computer browser).