Voice Control/Dialing E53- iPhone4 ?

[MauiKat]

Hi all, Wasn't sure whether to post this here in E53 or AV/Nav, but have a question: I have the original Voice Recognition module in my '05 X5, which I have used for years for cell phone dialing, with a (I know, waaaayy "old school" ) Motorola Razr v3 - I purposely have avoided upgrading the cell for years, due to the fact none of the voice recognition software, up until recently performed as well as the Razr, and I constantly use it. The Razr also pairs and works great with the X-5's Voice Control and bluetooth. I'm at the point where I really finally DO need to get a new smartphone, and the most logical choice after much investigating and comparison, is either the iPhone4 or the Samsung 'Droid Captivate, since I'm locked into ATT. Can anyone tell me if they have and use either of these phones with the E53 Voice Control, and/or if I'd have any problems pairing and setting up either of these with the older software in my '05? 'Would very much appreciate hearing from anyone with experience with either of these in this scenario - I'd hate to lose the Voice Control dialing-from-the-wheel option!