Samsung’s Galaxy Z TriFold is a phone, a tablet, and a realistic test of how much device you really need

Foldable phones have spent years trying to justify themselves. Some were too fragile, others too bulky, and most felt like solutions in search of a problem. The Galaxy Z TriFold is Samsung’s clearest attempt yet to answer a more reasonable question: Can one device replace the phone-tablet combo without becoming a chore to carry?

Coming to the United States later this month, the TriFold folds twice, opens into a 10-inch screen, and closes back into a pocketable form. It’s an assertive design, but not a novelty play.