What are the specific operation steps of China Telecom's 4G self-service card replacement method 1?

mode 1. insert the special card for 4G self-service card exchange and the existing 3G card into two mobile phones respectively. 1. card exchange preparation: please insert the special card for 4G self-service card exchange into tianyi 4G mobile phone, and insert the original UIM card into tianyi 3G mobile phone, and keep it turned on at the same time. 2. Edit the short message "HK mobile phone number" with 4G mobile phone to 1659157 to obtain the card replacement verification code (note: the mobile phone number is the original user's mobile phone number). 3. Check the verification code on the original 3G mobile phone, edit the short message "YZ verification code" to 1659157 using the 4G mobile phone, and wait for the short message of successful card replacement on the 3G mobile phone. 4. After receiving the SMS message of successful card replacement, restart the 4G mobile phone, and the original UIM card will be invalid. For more service offers, click on the "official website" customer service 221 below to answer your questions.