Shellphone

The Shellphone is a post-Skeletron informational item that combines the function of Cell Phone, Magic Conch, and Demon Conch. The player can press to cycle through four teleport locations: World Spawn, Ocean, Underworld, and Spawn Point.

Trivia

 * The tooltip is both a reference to the "shell" part of the item, regarding the belief one can vaguely hear the ocean if you hold a shell up to your ear, and the "phone" part of the item, regarding a common type of scam call, where the person being called is falsely informed about their car's extended warranty.
 * Unlike the PDA and Cell Phone, the Shellphone folds in half. This type of phone is commonly referred to as a "clamshell", thus the name is also a pun.