title: Running server on a phone, using cellular connection
body: <p>I'm curious to know, is it possible to run a server on a phone and use the phone's mobile connection as the external IP? I've seen many servers (web, ftp, etc) for android phones, but many of these say that it will host the server over wifi. I'm wondering if these types of servers can use the mobile connection to host their files?</p>
  
  <p>AFAIK, the phone has an IP address and no firewall.</p>
  
  <p>EDIT: This is not a discussion whether it is prudent to use the cellular connection, just whether it is possible.</p>