1. Huawei: Huawei Machinery Co., Ltd., BYD Precision Manufacturing Co., Ltd., Huizhou BYD Electronics Co., Ltd., Xike Communication Technology Equipment Co., Ltd., Huizhou Hong Guang Technology Co., Ltd., Huizhou Great Wall Development Technology Co., Ltd., Huizhou Bond Industry Co., Ltd., Dongguan Great Wall Development Technology Co., Ltd., Dongguan Huabei Electronic Technology Co., Ltd., Hongfujin Precision Industry Co., Ltd., Shenzhen Great Wall Development Technology Co., Ltd. Shenzhen Zhuoyi Zhizao Co., Ltd., Songri Digital Development Co., Ltd., Flextronics Manufacturing Co., Ltd., Guangdong Enoch Communication Co., Ltd., Guizhou Fu Zhikang Precision Electronics Co., Ltd., Shanghai Chen Xing Simitong Electronic Technology Co., Ltd., Jiaxing Yongrui Electronic Technology Co., Ltd.
2.vivo: vivo Mobile Communications Co., Ltd., Vivo Mobile Communications Co., Ltd., BYD Precision Manufacturing Co., Ltd., Huizhou BYD Electronics Co., Ltd., Huizhou Haige Technology Co., Ltd., Dongguan Huabei Electronic Technology Co., Ltd. and Dongguan Great Wall Development Technology Co., Ltd.
3.OPPO: Guangdong Opal Mobile Communications Co., Ltd., Dongguan Opal Mobile Communications Co., Ltd. and Huizhou Jinhu Industrial Development Co., Ltd. ..
4. Xiaomi: Inventec Technology Co., Ltd., Qi Long Electronics Co., Ltd., Fu Zhikang Precision Electronics Co., Ltd. and Jiaxing Yongrui Electronic Technology Co., Ltd.
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