Bitwings has partnered with a cloud mining firm NEOBit. The phone does not get heated up when it is mining. The battery life is good enough to mine Ethereum continuously.
I was thinking that it uses the proof of work, but it actually uses the proof of data. Thanks for sharing this information here.
Through the Smart Contract, Bitwings is able to capture computing power from rented pools. This is the prime secret behind their Proof of Data!