I've had a couple of occasions where I can't get the SD card to play nice when I switch it from one phone to another. Going from the G4 to the G5, I had to replace the card. The G5 would only see some of the pictures on the card. Putting the card into my computer, they were all there, so I don't know what thats about. I picked up a new card on sale, and just went with that, and the G5 seems fine now.