I was thinking about this recently - The iPhone supports bluetooth connection to Macs - this is clear through the ability to tether the iPhone, enabling it to be used to provide mobile internet to the computer. The Macbook or iMac's have built in speakers and microphones. These are options for the Mac Mini, or the Mac Pro. I believe that it would be convenient and cool to be able to connect an iPhone to a Mac via bluetooth, and then make or take calls through the Macbook. There exists a Nokia device for use in the car, and the Nokia Windows software allows for texting from the PC. Since the technology exists, I think that the ability to use the iPhone through Bluetooth on a Mac, would be very useful when using the iPhone at home or in an office. What I am not looking for is Google Voice, as it is US only, and I am in the UK (and don't really want to have to pay what would be in effect twice for every call) - in addition it would require me to make all of my various contacts aware of a new phone number - I have had the same mobile number since I was 12 and feel no need to change it. My question is - does an app/jailbreak app exist that allows this, or is there any other way of doing so?