The cellphone is of the items Lacie carries in Chapter 1. Stays with Lacie throughout the whole chapter (except the short period of imprisonment in the Facility), and is used several times to contact Hiro.
Description[]
It is a red flip phone with black buttons. Has a dark blue display during phone call.
Phone Battery[]
If Lacie uses her cellphone to go through the locked site, it is out of power by the time she goes to the Facility. and she cannot call Hiro.