i followed this advice from piston heads and paired my ohone 6 to my 2007 vantage no problem, it also worked with my iphone 5.
heres the copy ....This works after so many failed attempts

For anyone still having problems this is how to do it (I was using an iphone 4S on a 2006 Vantage):-
Put the iphone Bluetooth into search mode.
Tell the car -by pushing phone command button on wheel to Pair phone
Car tells you to put phone into search mode and then type 1 2 3 4 as the bluetooth code.
Phone will see the car - will list as Aston Martin. Put code in
It will then fail! Car says pairing failed.
But you now have the iphone recognising the Aston Martin bluetooth, so on the phone, select "Aston Martin" on the bluetooth menu. It will bring up the boxes to put in the passcode. Put in 1 2 3 4, but do NOT press pair on the phone yet.
Tell the car -by pushing the wheel button to pair phone. Then immediatley press the Pair button (top right) on the phone.
Should then pair straight away.
Have checked and phone is always then recognised on startup

 

thanks very much