If you had a botnet full of factory or seconded phones, with available power supply, they would do well. The samsung S4 19505, 2nd gen not the snapdragon octa, pulls 23-35h/s. if mining cryptonite..the phone uses about 2amps at 5v. nothing a battery and solar panel wouldn't fill....all for less than a monero cloud contract.....You think, if you were an e-recycle company, 50 bricked phones is nothing...