title: Using iPhone as a TCP and UDP server - open ports?
body: <p>I need to send and get packets via UDP and TCP in iPhones and the server. But, I figured that if I wanna send packets to a client (iPhone), he is... A kinda server.</p>
  
  <p>So, let's say I'm sending and getting packets to iPhone via the port 2347. Do I need to open the port on the iPhone or something like that? Is there any Firewall built-in to the iPhone?</p>