Flip phones were an important design constraint when phones featured physical hardware buttons. It was easier to flip open a phone to unlock it then press the weird key combos that some phones used.
With touch screens this is no longer a problem, and the design constraint for a flip phone is less relevant. If anything it now increases the time to unlock a phone if you have to flip it open first then authenticate with thumbprint or face scanner.
With touch screens this is no longer a problem, and the design constraint for a flip phone is less relevant. If anything it now increases the time to unlock a phone if you have to flip it open first then authenticate with thumbprint or face scanner.