Speaking of taking surveys for money, you can take surveys right from your phone as well when you sign up for sites like Opinion Outpost. Survey Spot (which is run by the same market research company as Opinion Outpost), and Surveys on the Go which is a site that's dedicated to providing paid mobile surveys.
There are tons of legitimate survey sites out there, but they may not have a mobile friendly website which would make it difficult to take surveys from your phone. Normally with survey sites, you'll sign up and fill out a profile. Then, you'll receive survey offers sometimes based on your demographics, interests, and experience.
Here are some more legit surveys sites you can check out:
It's not a predictable or stead way to earn, but yet and still you can make extra money during your spare time and you don't even have to be at home or at work.
