Good-Person
Captain Junkie
I have always use the cryptotab to mine Bitcoin and I was lucky to have some refferals in my downline which contribute to my earnings.
Cryptotab is a legitimate platform to mine Bitcoin using the phone or any other kind of devices.
I think that your earnings also depend on many big and important factors such as the kind of graphic card used by your referrals. This is quite important as far as I can think.