@Oparayj When you're done listening to Pandora on your iPhone, all you need to do is to press Pause and leave the app by hitting the Home button or going to another app. When paused and backgrounded, Pandora will use no CPU – iOS will effectively halt the process.
There are several convenient ways to pause:
Open the app and pause from the Now Playing screen.
From the lock screen, the audio controls should display automatically when you press the home button. If not, press the home button again to bring them up.
With the phone unlocked, swipe up from the bottom of the screen to reveal your Control Center. Here you will find all of your Pandora play controls.
Press the "microphone button" on Apple earbuds. (Double-clicking the button will skip songs.)
