"If you have a third-party Bluetooth-enabled device, you might be able to pair it with the BlackBerry Visor Mount Speakerphone VM-605."
That is Research In Motion's official line about the VM-605's compatibility. In English, this means that while RIM would rather you use this first-party accessory with its BlackBerry smartphones, there's nothing proprietary about it to prevent you from using it with your iPhone, Android phone, or Windows Mobile phone.
But why would someone without a BlackBerry even want a BlackBerry branded accessory in the first place? Well, the VM-605 has a feature set similar to our Editors' Choice-winning Motorokr T505 (including the nifty FM transmitter) and its MSRP is about $30 cheaper. Unfortunately, some of the design choices that make the VM-605 a more beautiful device than the T505 also make it a more fragile one.
Check out the full review of the BlackBerry VM-605 Visor Mount Speakerphone for more details.