Because different versions of WeChat cannot be added to each other. Only registered domestic real-name authentication users can add friends to communicate with each other in China. Foreign WeChat and domestic WeChat are two versions, and the information between the two versions is not connected, so communication cannot be realized.

Wechat is a free application launched by Tencent on 2011121,which provides instant messaging service for intelligent terminals. It was created by the product team of Tencent Guangzhou R&D Center led by Zhang Xiaolong. Wechat supports fast sending of free voice messages, videos, pictures and texts across communication operators and operating system platforms.