Its been a while where these mobile phone mining does already exist but most of them are scams and since we are talking for some legit company then i dont see for these things to be feasible.
Mobile phones are for the purpose of sending out text messages or solely speaking about primary usage of it and involving it on mining which would really spending
up power and processes and i dont know if these things are hoax or just simply image manipulation just to make it look that you are actually mining but you arent.
I cant just trust up these kind of projects but if there's someone who do get interested then it would be your choice.