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How should telecom users modify the service password through SMS?

Telecom users can modify their passwords by sending 502# old password # new password (6 digits) to 1000 1 and send 503 to 1000 1 to reset their passwords.

Telecom users can log in to the online business hall of China Telecom to modify the service password.

First log in to the online business hall of China Telecom, click Login and enter your mobile phone number, and then click Forgot Password, as shown in the figure below:

After entering, select the first reset service password, and then click Enter.

Then fill in your mobile phone number and the received verification code, and you can reset the new service password.