How do I sync my photos from iPhoto to my camera roll

I recently got a new iphone so I need to transfer my photos from my old iphone to my new one. I want them to be in my camera roll not in a saved album/photo library. How do i sync them into the camera roll? I only have a Mac so I use iPhoto to sync photos from my phone. I can't email myself these pictures because there are over 2000 pictures on my old phone.