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Message: <blockquote data-quote="Janx" data-source="post: 5617447" data-attributes="member: 8835">The same concept applies to the paradigm used on the game consoles now, the hypervisor isolates the app from anything else.  Of course that's the same feature that makes it hard to shard data between apps.A firewall itself would add network latency, consume already precious memory and technically add its own risk of vulnerability.I'm not familiar with iOS's network stack, but it might even be possible the nature of how it consumes network resources makes extraneous traffic meaningless (other than DOS effects).The more conventional reason a firewall exists is to block external access to all the various ports that 100s of processes are listening on on a Windows box.  If nothing is listening (and thereby reacting to a port) there's no risk on that front.  A mobile device has significantly fewer processes (and thereby open ports that need explicit blocking because they are just sittin around, waiting to give root access to the first connection that asks).A firewall may do more that just negate access to ports, but thats one of its primary functions and as such, it may not be as applicable to a mobile device.as to the sacred security of the App Store?  Once again Netflix documentaries comes to the rescue.  The film Freakonomics has a section on sumo wrestling.  It speaks of honne, the truth of things, and tatemae, the surface of things.  Just like the Japanese's 96% arrest rate on murders, the safety of the App Store is the tatemae.  What matters from a marketing perspective is that people feel that it is safer than the competitors.But like the fact that most people don't deploy a firewall between their cable modem and their house, they're lucky if MS turns on the firewall in windows for them, and its amazing if they actually have a valid anti-virus running.  Let alone, with all that crap, I've still seen my rigs get infected.</blockquote>

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