Protect your smartphone with a Samsung Galaxy Z Flip 4 phone case. Cases for the Z Flip 4 usually consist of 2 parts. That way, you can open and close your smartphone more easily. Z Flip 4 cases come in various colors and materials. A leather case looks stylish, but a silicone case is more flexible. Do you want more grip on your smartphone? Choose a case with a ring or strap. That way, you can hold your smartphone extra securely when you're making a call.