How do telecom users change their service passwords through SMS?

Call China Telecom self-service number 1000 1, press 3-key password service, press 2-key service password modification, press 1 to modify the password, and enter the original password #-new password # according to the voice prompt (press 2-key password reset, enter the owner ID number # according to the voice prompt, and you will hear the voice broadcast the new password). You can also send 502# old password # new password (6 digits) to 1000 1 to modify the password and 503 to 1000 1 to reset the password. For more service benefits, click "official website" below to answer your questions.