2. A system update notice appears on the mobile phone, and then click Update Now, so that the direct traffic is exhausted, or the arrears are stopped.
3. Then there is the problem of the game or other software itself. When playing a game, you may find advertisements on the interface of the game or software. These advertisements are downloaded by these applications on the Internet. Of course, it's not just these advertisements. The current software basically collects customer information, of course, only the IMEI number and model of the mobile phone, and does not collect phone calls and text messages in the mobile phone. Go back to the desktop, press the menu button of the mobile phone, and the menu, selection, add and widget will appear at the bottom of the screen. Find a gadget called "data communication" in it, add it to the desktop, and then use it to close the network connection when you are not online.
In fact, the third item above is the most critical. You must form a good habit and turn off data communication when you are not surfing the Internet. This will save a lot of traffic. Because many applications have their own networking functions, even if they don't use that application, they will still "secretly" network to handle some things.