John has a Samsung Galaxy S III phone, and his contacts are taking up nearly 10GB of space. Leo says that sounds extremely odd. Since it's been quite awhile sine John has reset the phone, he should try doing that. First he should make sure that the phone has been syncing and backing up his data. To do that, he can look at his Backup settings in the Settings menu and make sure it's enabled. He can even manually initiate a backup to make sure it's being done. Then he can do a full reset and that should clear everything up.