Charge the battery
Your battery has been partially charged at the factory, but you may need to recharge it before you can switch on your phone for the first time. If the phone indicates a low charge, do the following:
Connect the charger to a wall outlet.
Connect the charger to the phone.
When the phone indicates a full charge, disconnect the charger from the phone, then from the wall outlet.
You do not need to charge the battery for a specific length of time, and you can use the phone while it is charging.
If the battery is completely discharged, it may take several minutes before the charging indicator is displayed or before any calls can be made.
If the battery has not been used for a long time, to begin charging, you may need to connect the charger, then disconnect and reconnect it.