With my previous cellphone, I had the option of buying a $100 data kit from Sprint that would let me use the phone essentially as a modem. I didn’t spend a lot of time investigating this option, since it sounded like a lot of hassle for what would have been a really slow connection that chewed up a lot of airtime minutes.

A friend (thanks, Paul!) recently tipped me off to PdaNet from the June Fabrics PDA Technology Group. PdaNet lets your Treo function as a wireless data connection for your laptop. Unfortunately, your laptop has to be running Windows. After downloading the .prc file and syncing it onto my Treo, I was browsing the web almost immediately from my laptop (with WiFi radio turned off and no Ethernet cable attached, of course).

If you have a Treo 600 and a laptop running Windows, it’s a very well-spent $34. They offer a 15-day free trial so you can make sure it works for you before you buy it.

Treo 600 users need version 2.5.2, which came out less than a week ago. So far, it has worked flawlessly for me. At one point I got an error dialog on the Treo saying something like “Error: Serial: port in use (0×0307)”, but the dialog disappeared within a few seconds and I continued browsing as if nothing had happened. The FAQ explains that this is due to a conflict with the Sprint PCS Business Connection software when it tries to auto-connect and synchronize email and documents.

When PdaNet connected, it claimed that it had negotiated a 145 kbps connection. I tried the bandwidth meter at 2wire.com and got speeds of 107.8, 130.2, 99.9, 90.3, 90.5, and 79.9 kbps. During the tests, the signal strength on the phone stayed pretty constant at two bars.

I was even able to connect to my corporate LAN through our Avaya VPNRemote software as easily as if I were using a wired or wireless connection on my home LAN. Outlook was even slower than usual, but it was still better than over a dial-up connection. The 2wire bandwidth meter indicated speeds of 59.8 and 83.7 kbps over the VPN. Not bad, considering the overhead of the VPN encryption and the additional path through my company’s routers before getting to 2wire’s website.