Yixin is a free instant messaging software jointly developed by Netease and China Telecom, which has the functions of free telephone call, chat voice, free short message and telephone message.

Yixin supports Wi-Fi, 2G, 3G and 4G data networks, and currently supports iPhone, Android, WP mobile phone system versions and Windows PC platforms.

Security, all chat software is not much different, online chat will definitely be recorded, LAN, you can use a small source code of chat software, set it yourself.