Semi sales pitch post as I get fractions of a penny if you use my referral code as I'm trying to build a network in case this thing takes off...
If you'd like to earn some cryptocurrency using your Smartphone, I recommend checking out the free app called Pi Network. Pi is a digital currency that can be earned by running a light weight program on your phone. It runs smoothly in the background and will not compromise the performance of your device, and only requires that you open it once a day and tap a green button to ensure you remain active in order keep earning Pi coins.
Pi coins are worth little right now and can be mined quickly and easily for free. If they rise in price the way alt coins are expected to rise in 2020, the coins you mine today for free on your phone may increase in value drastically turning you a nice profit! Of course, they may also fail and amount to nothing, but what if Pi becomes the next Bitcoin? I mean, Bitcoin too was once worth a tiny fraction back in 2009 compared to what it is worth today.
Pi Network is available for Android and iOS smartphones and they require that you use a referral/invite code upon installation. Installation actually will not proceed without the invite code as the program is still in Beta testing so you may use the code: cpalaniuk
This is a free and easy way to dabble with Cryptocurrency and possibly make a lot of money in the future, depending on how many coins you mine and if the value of Pi rises in the near future as expected.
Good luck and happy mining!