Computer-to-computer network iphone no wifi

In my new workplace, I can't manage to network my iphone with my mac. I create the network (with password) on my mac. No problems. The network comes up in the settings on the iphone, and I type in the password and save it. No problems there either. I recheck the settings on the iPhone, and it tells me that I'm on the network. BUT: there's never a wifi icon at the top of the iphone screen - it still says 3G. And none of my apps can talk to eachother between the two devices.
I've tried toggling airplane mode on/off. I've tried restarting the iphone. No success.
Any clues, folks?
[iOS 4.3.3]

An Ad-hoc network like that doesn't have internet. It is a connection directly to the computer.
If you want internet, go to Sharing System Preferences and turn on Internet Sharing. Share your ethernet connection to Airport.  Limitations are only WEP security, and for some, Internet Sharing doesn't restart after computer restart. You may also have to manually add DNS settings to your iPhone to get to the internet. OpenDNS work well (there is alos Google, among others, or you own ISP's DNS).

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