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This video will show you how to get free bitcoins on any device running Android such as phones and tablets. Both these things can be done in just a few minutes a day, and can add up to decent bitcoins over time. Both the apps are free, and from experience they are currently completely legitimate.
The two apps are bitcoin tapper: https://play.google.com/store/apps/details?id=com.bitcointapper&hl=en
and Earn Free Bitcoins: https://play.google.com/store/apps/details?id=com.getfreebitcoins
The first app, Bitcoin Tapper, pays out a small amount of bitcoins when you open the app and tap the button. You can do this once every 24 hours. The app adds anywhere from .001 to .000001 bitcoins per tap, so it can occasionally be really worth it, or it can be kind of useless if you get the lowest end. But it only takes a couple seconds to do, and can't hurt. Once your total reaches over .012 bitcoins, you can request a payout. I have gotten a payout, so I know it is legitimate.
The other app, Get Free Bitcoins, basically links you to all the online bitcoin faucets so you can easily use them on your phone. You basically enter your bitcoin address into the app, and then it automatically pastes your address into most of the sites when you open them up, and you can paste it into the ones it doesn't.
Then you can choose the options you want to use to earn bitcoins. You can choose to complete captchas at bitcoin faucets, visit websites for bitcoins, or watch videos for bitcoins. All the options work well, and I have personally received payouts so I know it works.
At the end I also explain the option of bitcoin mining on android. I have personally only used it very little, and it overheated my phone without producing many hashes. If you want to try it out you can, as there are a couple of paid apps for mining, but I wouldn't reccomend it because you will never earn back the money the app costs, and it can damage your phone.