Bill. I'm going to give you the softest, gentlest advice I can...
F@CK VERIZON! All cellphone service providers are the exact same. Go with the one that gives you the phone you want.
With the trading capabilities of the iPhone, if you make one good trade on it that you wouldn't otherwise have been able to make then you have made back any money you may have lost in switching carriers.
The blackberry also has decent trading apps for TDA and ETrade and both can provide internet you your computer via PDAnet.
Currently I know of no cellphone apps of any kind for Scottrade.