What does the number "10" on the back of iPhone 6S mean?

It means that harmful substances in mobile phones will not be leaked for ten years.

This is the electronic information product pollution control sign.

Represents electronic products containing toxic and harmful substances;

The Arabic numerals in the circle represent the environmental protection period of the product.

The electronic information product pollution control symbol is the only valid identification mark used to declare that the product meets the enterprise's "Electronic Information Product Pollution Control Management Measures". Its connotation includes whether the electronic information product contains toxic or harmful substances or Elements, environmentally friendly use period of electronic information products and electronic products can be recycled or three other parts

The iPhone is a series of smartphones developed by Apple in the United States, equipped with the iOS operating system developed by Apple, Steve Jobs in San Francisco. The launch of the first-generation iPhone was revealed at the Apple Global Software Developers Annual Conference 2007 at the Masconi Exhibition Center.

The first-generation iPhone was launched on January 9, 2007 by former Apple CEO Steve Smith. Released by Steve Jobs and officially released on June 29, 2007.