There is a new coin called Pi Coin, for now you can mine it with your phone, it doesn't consume battery or any other resources from your phone.
Right now is on Beta stage, the mine rate is high due to being new.
You can find more details about it here: https://minepi.com/
In order to join you need a referral invitation, for that you can use my username "oPenguin"
It's available on iOS and Android stores.