4000 is not a big number, now the monitoring is the form of big data, you only have a long-term large amount of money out of the inflow and outflow may be monitored, so it's okay.

WeChat is a free application launched by Tencent to provide instant messaging services for smartphones. WeChat supports the rapid sending of free (consuming a small amount of network traffic) voice SMS, video, pictures and text messages over the Internet across communication carriers and operating system platforms.