One cell phone model was reported in 2010 to have a built in solar charger.
One such is the Strawberry Tree public solar charger. There are also public solar chargers for mobile phones which can be installed permanently in public places such as streets, park and squares. Some chargers have an internal rechargeable battery which is charged in sunlight and then used to charge a phone others charge the phone directly. Some can also be used as a conventional charger by plugging into an electrical outlet. They can be used when no electricity supply is available-either mains or, for example, a vehicle battery-and are sometimes suggested as a way to charge phones without consuming mains electricity, unlike electrical cell phone chargers. Solar cell phone chargers use solar panels to charge cell phone batteries.
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