Why is the traffic data monitored by telecom mobile phones greater than that notified by SMS?

Hello, maybe the mobile phone's own traffic monitoring software is not accurate.

I suggest you try Tencent Mobile Manager.

Tencent mobile phone housekeeper's internet management: real-time traffic statistics, timely reminder of excess, so that you know the internet traffic like the palm of your hand;

The networking firewall function says no to secret networking programs to avoid traffic loss.

Tencent Mobile Manager is a completely free mobile phone security and management software.

Hope to adopt. Thank you.