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........

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