What is the best smartphone for Interactive Brokers customers? iPhone? Blackberry? Something else? Specifically can you talk on the iPhone or Blackberry and use the Interactive Brokers mobile app at the same time? I know that some smartphones have limited multitasking capabilities. I don't want to get cut off from a trade because I have to take a phone call. I would like to be able to talk and trade at the same time. Is this possible? Thank you for any feedback you have on this.