I recently posted a write up about how I used my Motorola Razr as a bluetooth modem for my laptop, which let me surf the web on the way to work each morning. Well, sort of... it was extremely slow! Remember how slow 28.8k dialup modems used to be? This setup was even slower, and dropped the connection ever few minutes.
And to make matters worse, I discovered during the second week that Cingular doesn't actually allow their MediaNet plan to be used in this way. They officially require tethered internet traffic to use one of their "data plans", which costs $59.99 a month for unlimited internet usage.
After insisting on a full refund from AT&T (after all, it was on the advice of their sales rep that I purchased the MediaNet plan in the first place), I upgraded to their unlimited data plan and bought a Sierra Wireless AirCard 875u (USB Data Card with broadband speeds).
I'm riding the bus home as I write this, using the Aircard to connect my laptop to the internet. It's smoking fast!
I performed a speed test using http://www.speedtest.net, and registered about 1.8 Mbps download speeds (it's rated at up to 3 Mbps). That's faster than my company's T1 LAN connection, and I don't have to worry anymore about trying to find a wifi hotspot. It's always connected, wherever there's cell phone coverage.