This article is an investigation of composing practices through which people create networks with mobile phones. By looking through the lens of actor-network theory, the author portrays the networking activity of mobile phone users as translation, what Latour describes as an infralanguage to which different disciplinary perspectives can be appended. Given how much mobile phone use is information-based, the author describes how five people composed on mobile phones to create coordinated networks of professional and domestic activity. To arrive at this discussion, the author first considers the objectives of mobile networking, which include creating a sense of place and coordination within that space. The author then describes the findings of a case study of mobile phone users who build translational networks. The discussion focuses on the participants’ composing practices.