The smartphones are big part of our everyday's life. I use mine to earn some cryptocurrencies each day when I have a free minute or just in the background while I'm working at the office.
Here are 5 ways that you can make some change by using your smartphones.
1) Electroneum - I'm pretty sure you guys have heard about ETN by now. The phone app (Android and iOS) offers cloud mining, that is inconsistent of how much you make per day. And as far as I am aware you can mine it using an Asic.
https://play.google.com/store/apps/details?id=com.electroneum.mobile&hl=en
If by any chance any of you haven't joined already and wants to, feel free to use my referal code: 48F497
Keep in mind you cannot use multiple devices with different accounts because they have KYC authentication.
2) Phoneum - free cloud mining and a game. More info here: https://www.publish0x.com/welcome-to-my-life/free-cloud-mining-phoneum-token-mobile-xwwlew
3) Microwork - earn ETH by taking pictures with your smartphone. More info here: https://www.publish0x.com/welcome-to-my-life/earn-eth-pictures-you-take-your-smartphone-xqmrje
4) Bitcoin Blast - play a game and get paid in bitcoin. More info here: https://www.publish0x.com/welcome-to-my-life/bitcoin-blast-cool-little-game-pays-100-satoshi-day-xznozr
5) Pi - cloud mining app: https://play.google.com/store/apps/details?id=com.blockchainvault&hl=en
It is an interesting app that works in the backgroud. There is serious team behind it and the whitepaper that you can check and learn more about Pi.
My referal link is(in case anyone wants to join my team): https://minepi.com/dmad2010

Those are 5 ways I know. Please share if you know anymore methods that you know that actually pay.

Thanks and good luck to everyone.