We’re aware that some iPhone 4S users are experiencing issues with logging in to Spotify via GoTunes. We are working on the problem and will have a bug fix release soon. Thanks for your patience.
GoTunes is a FREE app for discovering the best music that fits your running and cycling exercise. The app utilizes Spotify streaming to deliver the music best suited to your needs. The app is available on the iOS App store for iPhone 4, 4s, and 5.