However, there is a behavior that can cause the bill to rise, albeit slightly. We are talking about keeping the cell phone charged even after it has reached 100%. The common practice is to charge it before bed and keep it running all night. Even if it has stopped recharging, keeping the charger in power still consumes it. Typically it drops to 2.24 Wh.
Even if the consumption is negligible, it would be a good idea to disconnect the charger from the power socket when fully charged. Just keeping the charger on without the mobile phone connected is wrong behavior. In this case too, in fact, the transformer consumes.