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You should charge the phone battery regularly to ensure that your phone is always ready for use.
Connect the charger to your phone
Connect the charger to the phone socket and to a wall socket.
When the vertical lines in the battery icon are moving, charging is in progress.
When the battery is fully charged, you can remove the charger from the wall socket and your phone.
When your phone is turned on, you can always see the battery power level. The bigger the coloured section of the battery icon, the more power.