Have this BT part built together with the KIV-700 recently. Was initially very excited about how things go but like many others wrote already come the problems insidious! Was shortly before returning as with thankfully the weekend came in between. So much sought and at Kenwood an update to version 3.30 found that must be transferred via Bluetooth. So laptop with BT concerned, it was pretty easy for guidance! So now after a lot of testing no more problems with iPhone 4s. ) Now so highly recommended but unfortunately only a lot of trouble; Hope remains for iOS6 also so. Therefore 4Sterne