Pandora was a great service on your computer, but it's even better on your phone. Having the free app means that you can discover new music on your morning commute, at the gym, or wherever you happen to be. If you already have an account, you can sign in and easily access any of the channels you created on the web. And don't worry if you created an awesome channel on your phone — it will all transfer back to your account so you can access it on your computer.