it could be a device that we use explode ,, it might be the worst possible thing that can happen ,, and actually I was less understanding about this mining app ,, but what I know we need something to make in cooling
I'm not entirely sure what you mean by your post but yes the main problem is overheating as phones don't have fans.
If there was a shut-off point once the internal CPU reaches about 55 degrees Celsius then that might be helpful at reducing the risks. The exploding part is a bit uncontrollable though (unless you limit the phones use to not being on battery while the mining app is running - some phones now don't have a removable battery however).
No, not a good idea to mine with phones even you could run your phone without battery while mining it can be damaged any parts of PCB board.
There are possible parts could be damaged while you are mining. Samsung parts are CPU, Ram memory, wifi IC, Bluetooth module, Signal IC, Video IC, Power IC and other parts.
If you use your phone for mining the parts that I think could be damaged are CPU ,Ram memory IC, Wifi IC, Signal IC and Power IC and some of the samsung parts are sealed so, if the phone is damaged it would be hard to repair and fix the damaged parts or even replace a new IC it would be hard where to buy a compatible IC unless if you have a same scrap board.
So for me as a tech it is not recommended to mine with smart phones.
I have an idea since there is android OS that you can install in Desktop and run your computer like a smartphone. You can be still mined with altcoin using the Remix OS. it might be a good idea if he can develop a new mining software for the Android OS, then it should work on PC with Android OS, less risk and you can run them 24/7 without worrying about the parts because it's replaceable.