The Cell Phone is an accessory introduced in 1.3. It displays most statistics and allows the player to return to their set spawn point, similar to a Magic Mirror or Ice Mirror. It is crafted with a PDA and a Magic Mirror or an Ice Mirror.
This item is not an accessory despite it's abilities. It cannot gain modifiers and cannot be equipped in an accessory slot. This is likely done because of it's teleportation function (similar to the magic mirror) becoming unusable when in an accessory slot.