2019-6-25 · The flip or clamshell is a form factor of a mobile phone or other device which is in two or more sections that fold via a hinge.If the hinge is on a long edge the device is more likely to be called clamshell than flip phone (e.g., Nokia Communicators). Generally speaking, the interface components such as keys and display are kept inside the closed clamshell, protecting them from damage and ...