I know digging a coin on a smartphone is still possible because the chip on the smartphone is now quite powerful but how much dig you dig, I think when you dig a coin or something Then you have enough money to pay for the replacement of the phone chip, charging power ... With the intensity you dig up the coin, I think you will let the machine run 24/24 to you phone of You will be back in a few days when there is no heat sink on the phone. To me digging a coin on a phone is a stupid thing when I consider the practicality achieved.