I tried mining for CryptoNight coins on a high end smartphone using an octacore CPU, 8GB ram and powerful mobile GPU but got a max of 40h/s... very low. Not to mention that the phone would get really hot and the power would drain fast.
In the end you'll ruin your phone battery and need to replace it. The cost to replace the battery would be far more than you can mine with it.
No. Sell it and buy the coin you expect to increase in value.
Best advice you got today. I suggest following it.