Couldn't cancel the subscription after the 'free trial'! It could only let you try the service after submitting credit card info. I found it not suitable for me as it doesn't applicable to e-book apps, so i immediately tried to unsubscribe. There's no access to billing info on app and i could never successfully login to check with computer. Even though I cancelled my credit card subscription on Google play (as this app suggested) 3 days later it charged me USD139 anyway. Feel like being trapped!