According to an article posted on Weibo, Apple is developing iPhone with waterproof and dustproof functions toward the release next year, and they have already made its prototype.
Additionally, the device is said to use a non-metallic frame.
According to another posting, Apple is going to adopt a frame using a new material next year, It is also said that iPhone 6s and iPhone 6s plus are the last ones that use the metallic frame.
Finally, a reliable source tells them that the iPhone 7 will adopt a completely flat LCD.
It's still pretty early for concrete information about the iPhone 7 but it will be interesting to see how Apple plans to top the iPhone 6s.
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