I already evaluate this “exaggerated” warning because it comes from one or two small newspaper reports from third world countries where a person was affected or killed by the use of the cell phone while carrying. But no one talks about brands or the situation in which the case occurred, meaning there is probably much more involved.
Assuming the report was accurate without regard to any environmental factor, it is fair to conclude that either the phone or the charger was defective since you will not be able to find many reports of people being electrocuted while using a carrying cell phone. Also, under normal circumstances, the current flowing to a cell phone should not be strong enough to kill anyone, and neither manufacturers nor consumer agencies warn customers against using cell phones while they are being charged.
In these circumstances, therefore, it is excessive and an unnecessary zeal to think that you are at risk when using a cell phone properly registered by Anatel and with an INMETRO seal.
Which is not to say that no one has ever been injured by a cell phone. Over the past few years there have been several reports of cell phones catching fire or “blasting”, causing injury to their owners. Most of these incidents were attributed to the use of unauthorized and / or defective batteries.
To avoid such accidents, do not use incompatible or unauthorized phone batteries and chargers. Do not tamper with the battery or allow it to be punctured, crushed, or come in contact with metal objects outside the phone. Avoid damaging the phone by dropping it on the floor, keeping it where it might overheat, or allowing it to get wet. Follow the manufacturers instructions for battery usage, storage and recharging. You might even want a cheap cell phone , but never buy a ling ling.
And above all, do not pick up a phone carrying barefoot or wet, because then yes, you take a risk.