Google Opinion Rewards
Google play rewards it one of the best apps for paying you money for nothing. You can install it to your phone from here. The app sends through a notification to you whenever there is a new survey available for you to take and it pays you in Google Play Credit. This lets you buy apps, books and music from the Google store.
Usually answering surveys for money just isn’t worth the effort, but occasionally it is. Each time I’ve been sent a notification with this app I’ve had to answer one or two questions. It takes about ten seconds, and usually pays between 10p and 20p. It’s no effort whatsoever to use. There aren’t always surveys available, so you are limited by Google as to how much you can earn, but when there are surveys it’s easy money!