Is Sprint's version of Blackberry Storm uses EvDO Rev 0? If so, you may not be able to talk and surf at the same time. I got Samsung Ace from Sprint (Blackjack II from AT&T minus GPU and smaller screen), and Sprint customer service told me I am not able to surf and talk at the same time, so I use my AT&T GoPhone for voice calling (Pay As You Go Unlimited). I chose Pay As You Go instead of Pick Your Plan, as I don't talk a lot on a phone (I have Vonage 500 Basic for $14.99).
With a $50 data plan from Sprint and Pay As You Go from AT&T ($1 access for a day and $0.10/minute), I could substitute $20 for a WebCapTel service, even though it's free.
