Earl accidentally deleted all of his vacation pictures on his phone. What can he do? Leo says that to guard against this in the future by using Google Photos, which will automatically upload his images when he's on a Wi-Fi connection.
Flickr does too.
With a little effort, Earl could use some recovery tools to restore them, but he'll have to make sure he connects his phone to his computer as a mass storage device. He'll be able to find that in settings.