There are no shortcuts to answer your question, it takes personal experience. However, I would advise never
to mine with anything that has a battery unless it's ready to be junked anyway. Mobile devices aren't designed
to be run hard and don't have the heat dissipation necessary for 24*7 operation at full load. It could also be a fire hazard.
There are ways to mine however you need to invest some money. First issue is your electrical bill, if its like $0.10 kwh then its not worth mining anything. If its half that then you have some options.
You can get an ASIC however the latest ones are very expensive. At the current rates you will only make a profit if the underlying coin goes up in the near future. Hence you might as well just buy BTC and hold it.
You can get a desktop computer and buy a GPU like an RX 470 8GB and make like $0.25 per day per card before electrical costs. Same with getting a high end CPU like Ryzen and mining XMR. However the profits are small. There really is no point at the moment.
You can download the app on your smartphone and the app simulate a mining operation based on the power of your device, and will not consume any power or resources, the app can be closed
The only effort you will need to do is to enter on the app once a week and press a button to extend the reward
It's not a huge amount of money, but if you hold for some months the amount will be good
If you need better explanation, please leave a comment here, but it's very easy