Nokia has developed alerts for mobile phones to remind users to unplug the chargers from the wall once charging is complete. Users typically unplug mobile phones from the charger when done charging, but many leave the charger plugged into the wall. Even without a phone attached, the charger continues to draw current and wastes electricity. Starting with the mass market phones announced last week and eventually encompassing the entire range of Nokia phones, the alert will help save enough electricity to power 85,000 homes per year.