S - using itouch for remote access without firewall ?

I have an ipod Touch, and I am curious about using it for a remote access solution.  It has a VPN and I can use it to VPN into my network, check mail, etc.  But right now I only use it on the 3 networks I setup, home, inlaws, and work ,because I know they are secure networks.  But that makes the usefulness very limited.  If I am out and about, I would like to use it for connectivity, but I do not trust that there is not a firewall with an "on" button, as that would make me feel much more comfortable with using someone else's wireless network.

Does anyone know of a way to confirm that there is a FW and it is on?  I guess I can wait and see if someone makes one available via the new App store, but I was just curious.

Thanks,
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