Won't they have the same problem with you always using your phone to trade?
I run IB's TWS on my home PC and connect to it using remote desktop over my verizon vz6700 phone. The same phone is also available from sprint among other carriers, but I think any windows pda can serve as a client for remote desktop.
The web browser can handle full web pages without any problems (other than the screen size being so damn small).
SSB