http://blog.pandora.com/us/pandora-t...ad-free-music/

To sign up, tap the Pandora link in the T-Mobile Tuesdays app (available on the App Store and Google Play) between 4:59 a.m. ET on August 28 and 4:59 a.m. ET on August 29.
https://www.t-mobile.com/apps/download-t-mobile-app

*Limited time offer; subject to change. Claim in T-Mobile Tuesdays App by 8/29 4:59 a.m. ET and redeem with Pandora by 9/4 at 4:59 a.m. ET for 12 mo. subscription. Limit 1/account. New Pandora account may be required. Pandora terms apply. If you cancel T-Mobile service, free subscription ends.