Mobile phone trading...

Out of contract on my mobile and looking for upgrade, but dont know what mobile phone to go for? I would like something that i can trade on, but haven't been able to find out much info from the sales guys at Carphone warehouse/phones4u etc, so wondered if anyone can give some input as to whether the Samsung omnia eg supports Java or at least can provide realtime prices etc I've heard of people being able to place orders with IG on their I-phones, but dont think java can be installed...
Any recommendations for a decent attractive phone which i may be able to install and load the TDW (city index) trading platform on, and use while on the go...???
comments welcome.
I mention the omnia cos of its looks and previously having had a samsung, but not too bothered, anyone got a blackberry?