charging itself creates some heat, and if you’re using your phone at the same time it gets even hotter. All this extra heat can damage your battery and other parts of your phone over time, making it work worse or even break entirely.
Another risk of using your phone while it’s charging is the potential for electrical hazards. If the charger or the phone’s charging port is damaged or faulty, there’s a risk of electric shocks or short circuits,
That’s kind of what happens when you use your phone while it’s charging. The charger is trying to fill the battery (the bucket), but you’re using the phone (taking cups of water out) at the same time. This can seriously slow down charging, especially if you’re doing things that use a lot of power, like games or videos.