Jimmy T.'s cell phone
From the Super Mario Wiki
Jimmy T.'s cell phone is a cell phone constructed by Dr. Crygor for Jimmy T. There might be different phones rather than just one. Jimmy often comes up with the device during his performances. In his first appearance in WarioWare, Inc.: Mega Microgame$!, Jimmy owned a blue cell phone or even three phones, since the phone appeared in a different color in each of his stories. In WarioWare: Twisted!, it was replaced by a red phone that differed in appearance, implying that Dr. Crygor created multiple cell phones or that he upgraded Jimmy's device. Obviously, the other members of the Thang Family are also enthusiastic about cell phones, using their devices in their appearances in WarioWare: Twisted! and Touched! as well. WarioWare: Smooth Moves is the first game in which Jimmy T. didn't use this item. In WarioWare, Inc.: Mega Microgame$!, WarioWare: Twisted! and WarioWare: Touched! the countdown sound effect is replaced by a sound when something is typed in a telephone in his stages and the Thang remixes.