Some road warriors may be a bit disappointed that AT&T has still not announced plans for tethering their iPhone to their computer to share its network connection. This is a real help to some users as they can use their iPhone’s 3G cellular connection with their laptop when there is no WiFi to be had.
As I am sure AT&T eventually bring a tethering plan to the iPhone, especially since iPhone 3.0 includes features for tethering via Bluetooth and USB in the OS. Don’t expect it to be free or even cheap. Tethering plans tend to run $30 or more a month with most carriers.
In the meantime, Cleve Nettles over at 9to5mac has a quick tutorial to get tethering working with your Mac in a few easy steps.
AT&T was probably the main reason that Nullriver’s NetShare, an app that allows you to use proxies to share your iPhone’s cellular connection with your Mac, was quickly pulled from the App Store. I was one of the lucky ones who purchased this app as it was only available for a few hours before being yanked forever from the US iTunes App Store.
Well I am happy to say that NetShare is STILL working with iPhone 3.0! Best $10 I ever spent.

Other solutions for serious road warriors is to buy a separate broadband plan and pick yourself a CradlePoint Router [see my review] or check into the new MyFi Mobile Hotspot from VerizonWireless. With these devices you can have WiFi almost anywhere even in your car!

These solutions are a bit more expensive, but may well worth it to some users that need a connection 24/7.
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I tried the hack mentioned above to get tethering and KEEP Visual Voicemail working and I found that if you use the file located here http://cybernetnews.com/iphone-3g-tethering-att/ in this post you can get it all together working with ease.
ONLY thing you should know is that you can not use OS X to unpack the .zip file USE Stuffit Expnader (free) or the file will not be allowed to be selected in iTunes!
This works like a charm! Thanks!
The speaker seems to be the same (rubbish) one, ( Contact searching is great, no longer do I have to scroll through my contacts to find someone.