What are cell phone faceplates for?

According to Wise Geek, a cell phone faceplate is a durable snap on device that covers the exterior of a cell phone in order to protect it from unintended damage. Cell phone faceplates are also often used for customization and decorative purposes.

Cell phone faceplates are generally made of durable plastic material shaped to the specifications of a specific phone. Occasionally, faceplates may be waterproof to protect the cell phone from accidental water damage. Snap on faceplates are considered to be superior to protective devices that slip over cell phones, as faceplates do not interfere with the use of any buttons or touch screen components the phone may possess.