Earl, In addition to the references I've given previously, my *personal* experience with this has been that T-Mobile does NOT charge for roaming in areas not served by T-Mobile's own network. I tested this extensively this past week while traveling through Indiana, Illinois, Missouri, Oklahoma, and Texas. I roamed on Cingular, CellularOne??? vs. US Cellular???, and something labeled USA 040. I was never charged more than 10 cpm, although it wasn't really 10 cpm because I only paid a net of $64 for a $100 calling card, so it was more like 6.4 cpm. I DID find that I had to force roaming in several places instead of the phone automatically finding the roaming carrier on its own, which is what it does when I'm at home and lose the T-Mobile signal. Oh yeah... I almost forgot... I also roam about 95% of the time whilst in my own home with never a roaming charge.

I have found T-Mobile to roam quite nicely in Oklahoma. In NE Oklahoma, I am able to roam on Cingular and Dobson when I'm out of T-Mobile's coverage. I was surprised when my phone picked up Cingular, but it did so automatically!

Yeah, T-Mo To Go roaming does rock pretty hard ;). In the Carolinas, where T-Mobile has no native signal, your phone is essentially an uber-cheap Cingular prepaid phone, or SunCom, if you roll that way. Down here in Texas, T-Mobile To Go will roam on Dobson CellularOne if there's a need. Yeah, T-Mo To Go is jsut that cool.

OK I believe you. If I ever roam I'll post back.