Yes you can share one connection method through another connection method with your Mac (it's called an AdHoc connection). It's pretty easy, although the range is limited.
Go to System Prefs>Sharing>Internet Tab.
Share connection from Ethernet.
Click the box for Airport in the "To Computers Using:" box.
Look for networks now with your iPhone, you should see your Mac's short name now available.
Enjoy.
I used to use this method to connect my Nintendo DS to the internet for online play.
Some ISP get mad at you doing this... Not sure how they find out about it, but they can cancel your service due to violating terms of service? Why... again.... dunno.. I just know what my computer pops up a message saying so whenever I trying doing this..
i have an airport express but my school dorm doesnt allow wifi routers in dorms.
I think there may be an airport express setting not to broadcast your SSID (wireless name), then it's just a simple case of hiding airport![]()
So at least on our campus, you can't get away with a WiFi router for more than a couple hours before they kill your network connection completely, and you get a nasty phone call and e-mail.
How do you get the email?![]()
Ok I dig what you are saying.