How to send text messages to check the internet traffic of mobile phones?

Hello, taking telecom as an example, telecom users can edit the short message code 108 1 send to1kloc-0/to inquire about the internet traffic, download and install the telecom handheld business hall on their mobile phones, log in to the telecom mobile phone number directly to inquire about the traffic usage, or pay attention to the official account of telecom WeChat and bind the mobile phone number to inquire about their own traffic usage.