Does Pandora automatically connect/open?

I see that newer Mazda Connect systems have the Pandora app, and I know that to use it the Pandora app needs to be on my phone and my phone needs to be paired with Bluetooth to the car.

But do I need to manually start the Pandora app on my phone to use it with the built in infotainment Mazda Connect system? Or can I literally leave the phone in my pocket, get in the car and tap Pandora on the infotainment screen which will then launch the app on my phone (and remain in my pocket, never needing to take it out)?

Thanks!