Fred Jones, Jr.'s smartphone

A smartphone belongs to Fred Jones, Jr..

Scooby-Doo! Mystery Incorporated
Fred called his father to pick him and the gang up when they stuck in Gatorsburg.

He downloaded an app to his phone that could detect and warn him (by making loud burping noises) if anyone broke into the Mystery Machine. (Pawn Of Shadows)

Appearances

 * Scooby-Doo! Mystery Incorporated
 * The Creeping Creatures
 * Pawn Of Shadows