Just put Alpine's new CDE-HD137BT head unit in my car, and when the D4 bluetooth isn't being cranky it works great for navigation and listening to things like YouTube channels in the car. The radio is designed to let you control Pandora on an Android phone, but I can't get that feature to work with my Droid4 (unrooted). The phone is paired & connected to the head unit, BT audio is working, I have the Pandora app running with the "automotive mode" setting activated in the app, but the head unit just says "NO PANDORA". Seems this is a permissions thing -- I had to grant a pop-up permission question to let the head unit download my phonebook, but nothing pops up for Pandora. This would seem like an Alpine forum question, but they don't have one. Ugh. Figured I'd ask here to see if anyone has suggestions.