I purchased the TomTom app for £31.99. One of the stated features of the TomTom app is " Audio Output Switch : Easily stream all iPhone audio to the powerful speaker of the TomTom Hands-free car kit (or any other Bluetooth A2DP device)." However, this feature is not present on the app. TomTom say it is a known issue, refuse to give any money back and say they can be of no further assistance. You have to use the iPhone speaker which is not great in a car. So Buyer Beware, you can't use Bluetooth on the TomTom app even though they advertise on the iTunes store that you can.