Clamshell Phone

What is a Clamshell Phone?

A hinged cellphone that is more compact when closed. The cover "flips open" to reveal the screen, keypad, speaker and microphone. Also called a "clamshell phone," the flip phone is a basic cellphone without Internet access. A step up is the "feature phone," which may offer Internet access (see feature phone).

Sources:

https://www.pcmag.com/encyclopedia/term/flip-phone