I currently own a Treo 600 - I love it - I use it for my business. My carrier is Tmobile. I have been with them forever, love their customer service.

My new car only is compatible with the Treo 650 through Sprint.

I have to use a Treo for my business software.

My dillema is - do I cancel the Tmobile service to buy Sprint, or is there a nice way to get a second "compatible" phone from Tmobile (they have two) just for the car, have a second line, and somehow have a neat tidy way to forward the calls to the car phone when I'm in there, and then keep using both phones?

I'm not concerned so much about the cost as the convenience of my current carrier.

Help please!