said by PolarBear :

That doesn't make sense that T-mo would block Android tethering, when my T-mo Curve does it natively - it does it without any apps.

I simply plug the phone into the PC via USB (after installing the drivers from Blackberry, of course), tell Windows to dial *99#, and voila, dial-up connection.

If it's so easy to do on their hal-dozen or so models of Blackberry, why block it on the one and only Andriod?