I came across this coin project called pi. Apparently it's mined through your phone and there's 10m people so far.
I mined a few coins, if anyone wants to check it out I can invite you but it's invite only. Go to
www.minepi.com/Walkingstiff make sure you use thf invite code Walkingstiff
Another newbie posted a thread sharing his referral link again

. I saw another one few days ago.
Nice try still to advertise your referral link. Anyway to answer your question, if mobile mining was possible and profitable then all of the users right now must be rich. I still remember Electroneum when they allowed the users to mine ETN and just doing nothing. Now its price isn't recovered after a few years. If Pi Network will be successful, I think that it will be the same as Electroneum.