Despite it is not a hard thing to remove the charger from an outlet after being done with charging a phone, it is easier for us to leave it plugged on the wall, since we are using it frequently.
Despite the phone being done with draining power from the outlet through the charger, after being charged, the outlet will keep giving power to the charger. That means that you will keep using electricity, even if it is in small amounts.
The voltage changes in the charger can also led to deformation of its components. The overheating can even cause a fire from the charger.
Also, having children or a pet in the house can be dangerous too, since both the child or the pet can harm themselves, or they can damage the charger or the outlet, which can cause even more scary things.
What do you think? Let us know.