The Samsung Galaxy Z Flip 4 is a modern version of the old-fashioned flip phone. You can close this foldable smartphone when you're not using it. It's nice and compact that way, so you can easily take it with you in your bag or pocket. Want to keep your hands free for a selfie or a video call? Fold the device at a 90-degree angle and put it on the table. You can buy the Galaxy Z Flip 4 as a SIM free device. That means you can use it with a subscription with any provider.