Alya's cellphone is a smartphone that belongs to Alya Césaire. In "Lady Wifi," it gets infected with an akuma, turning Alya into a villain; it then serves as her weapon. After her time as Lady Wifi, Alya gets a new phone.
The cellphone is a black smartphone with a silver edge around the screen and a ladybug ornament hanging off of it with light magenta string. As Lady Wifi's weapon, it has a white case with black stripes on its back. After the events of "Lady Wifi", Alya gets another phone with a light blue border.