A modular mobile phone includes a printhead and ink supply module that is received and retained into a support chassis. A battery module cradles the printhead and ink supply module from a rear side of the mobile phone. An external casing locates on a front side of the mobile phone and is configured to mate with the support chassis. In an assembled configuration print media entry and exit slots are provided between a portion of the external casing and a portion of the support chassis. The print media entry and exit slots communicate with an internal transport assembly of the printhead and ink supply module.