Why does Huawei t8600 need traffic when sending text messages to make calls? depressed

I am also a Huawei user. The landlord clicks the menu button, and you will see a notice point notice. Then turn off the data switch. This will not take the flow. Then turn on the data switch if you want to surf the internet. Turn it off if you don't surf the internet. Like I said. Finally, it is suggested that the landlord study more. About the use of smart phones.