Where can I send the verification code for installing the 4g module?

SMS. The abbreviation of CAPTCHA (Fully Automatic Turing Test to Distinguish Computers and Humans) is a public and fully automatic program that distinguishes whether a user is a computer or a human. The verification code for installing the 4G module will be sent to the mobile phone text message. 4G communication technology is the fourth generation of mobile information system. It is a better improvement on 3G technology. Compared with 3G communication technology, its greater advantage is that it combines WLAN technology and 3G communication technology. A good combination makes the image transmission speed faster, making the quality of the transmitted image and the image look clearer.