This other day, I tethered my cellphone (Samsung SLM A747) on my MacbookPro over a bluetooth connection. Now I can use my cellphone to connect to the internet virtually everywhere. The nice thing is that you don’t have wires in you way. How to do it ? First you need a cellphone with an edge/3G network and bluetooth . After it is very straightforward using with Mac OS X (10.5) . Once your cellphone and mac are able to see each other, go to Preference panel / network / bluetooth. Click on “configure a bluetooth device” and follow the instructions, select your cellphone in the list. When it asks  “do you want to connect to internet using your cellphone ?”  select yes. When you are done on the bluetooth panel (network preferences), select “display modem status in the menu bar”. Done ! To connect, just go to the menu bar and select ” bluetooth connect”

The good thing: Internet pretty much everywhere totally wirelessly. The speed depends on the strength of your cellphone reception. The bad thing: expensive since without DATA plan, ATT charge $0.01 per 1Kb. So I added the unlimited DATA plan (MEdia Max Unlimited) to my contract so I won’t have to pay a ridiculous expensive bill.