When you see this title, you may think that there is some contradiction. The mobile phone is almost out of power. Who will send messages with the mobile phone code? Isn't it more power consuming? In fact, this is a portable mobile phone charging station powered by solar energy. When your mobile phone is almost out of power, you just need to send a text message, and the local power supplier will "remotely activate" your portable mobile phone charging station, similar to the principle of putting money in many cities in China to charge electric vehicles.

The little boy's mobile phone is a portable mobile phone charging station powered by solar energy

Sending a text message can charge your mobile phone, which sounds really magical. This is a company called Buffalo Power Grid, headquartered in London, and the amount of charge for sending a text message depends on the local power supplier. Of course, there are only some relatively backward areas in this way, such as Uganda. They may spend about $0.20 in exchange for a 60 watt solar panel. Although some of them may earn less than $1 a day, the mobile phone power they exchange for $0.20 is enough for them to use. Therefore, this way of charging mobile phones should be the most economical, affordable and environmentally friendly way.

I guess they don't use smart phones.