I have Peugeot 307 sw 2007year it has Bluetooth but it only for making calls,but I want to play music on it and don't want to buy any adaptor's. So I know it possible to create/or it exist an app which can play music over phone call. For example I have Google offline maps and it talks the directions over my car Bluetooth 🔊 "play as Bluetooth phone call " this option I need on an app to play music thrue. I have checked about 15 apps today, no one have this option. Can you guys help me with that please?
Really, the best method is to just get a Bluetooth adapter from amazon or something.
More apps can be integrated with regular Bluetooth and you will still be able to use the Bluetooth thing built into the car for calls. On android there is an option to choose what a certain bluetooth device is used for.
This would also be better than any hack or workaround because it will always be in a 'call' and will probably drain more battery. Also, a app cannot intercept all audio (which would be needed to send everything to the speakers) unless your phone is rooted.