Alert the user to turn on the power switch after plugging in the charger.

[siddhesh46]

Please add a feature that detects when the phone is plugged into a charger but not receiving power (e.g., switch is off) and alerts the user with a notification or sound reminder.
Many people forget to turn on the power switch after plugging in their charger, and a reminder feature could be really useful.

[realaud]

Usually when you connect to a charger, you get the charge notification sound and an animation. Lack of sound or animation due to no power being delivered should be sufficient.

[LongHiker]

@siddhesh46 Are you referring to the power switch on the phone, or a power switch controlling the AC outlet/adapter that you are using?

Either way, as @realaud mentions, taking a look at the screen when plugging in the charger should alert you.