Report claims that the "world's largest bank" looking to trade-up to Apple's mobile phoneAt the moment, Research In Motion's BlackBerry is very much the dominant player in the corporate smartphone market - a position it has held for some time and in which it is well and truly entrenched. It's the game to beat if Apple wants to boast about enterprise adoption of the iPhone, and so far it's got little more than a few careful sniffs. One of those sniffers, however, happens to be one of the biggest companies on the planet.