Is mining with mobile device a profitable venture today? I read a bit about this and learned that Monero maybe worth mining. then there's Electroneum as well. I wanted to know from other's experience.
One might ask why spend on buying phones. Instead get a PC. Thing is I have few old phones that I can't sell, I want to see possibility of getting some cost back before giving/throwing them away
No, it's not profitable at all, the hash rate you can get with phone can't be compared to mining with gpu or even cpu. It's hard to get profit with cpu so don't expect to make money mining with phone because it's not made for mining. I think you'll break your phone first before you make some significant amount from it.