Iphones
There have been a lot of accusations over the years that the Chinese government has been stealing intellectual property from the United States of America and vice versa. China has been fearful that the Americans would try to get into their markets with Apple products and be able to spy and steal from them.
This was one of the reasons and also some more legal issues with patents and so on. Although it is not a full ban yet, they are slowly discouraging the sales of Apple products but recognize how hard it will be to stop their sales forever because of their massive popularity.