Windows Phone Thoughts: Switching Wireless Carriers to Save Money: Anyone Doing It?

"Last week, I offered advice for existing wireless customers on getting the best price for a new smart phone. One option I didn't mention is switching service providers, and that's what I ended up doing. I switched from Cingular to Sprint when I wanted to upgrade to a Palm Treo 650 but not pay the full price. I'll explore that option this week. Why did I make the switch? I had a couple reasons...So I paid $300 for a Treo 650 from Sprint. Given that I was still under contract with Cingular, however, that carrier hit me with a $150 early termination fee. Thus, I paid a total of $450 for the Treo 650, which is $75 more than what I'd pay if I'd stayed with Cingular."

The author goes on to say that by switching to Sprint and the $10 a month plan for web/email, he'll save in the long run. Have any of you switched wireless carriers to save money? Or do the devices available on a certain network lure you away? In this case the Treo was available on all the networks, but with Windows Mobile devices that's often not the case - if you want the Treo 700w, you're going with Verizon.