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1.90 In the middle and late 1990s, mobile phone cases became popular with the help of mobile phones to lose weight. Its types are also diversified with the increase of brand and function of mobile phones, which are divided into leather, silicone, cloth, hard plastic, soft plastic, velvet, silk and other categories according to texture, and there are differences between straight and flip by model. Limited by the model, the applicable categories of mobile phone cases are also different. Straight board can usually use all kinds of mobile phone cases, and sliding folding can only choose leather cases.

2. Development history: Mobile phone case is no longer a simple practical commodity. With the popularity of mobile phones among young people, almost every young person who pursues fashion wants to have a unique mobile phone. Beautifying mobile phones has gradually become a way for them to show their individuality. In order to cater to this trend, manufacturers of mobile phone protective covers have introduced many products with better workmanship and more unique color patterns. This makes the types of mobile phone protective cases more diverse. Note-metal frame-vertical holster