Telecom Tianyi cell phone can't get the service password by sending SMS, you can use the following methods:

(1) Log in to Telecom's online business hall, click on Forgot Password in the login interface, and then enter your ID card number and cell phone authentication code as required to apply for the password modification.

(2) Bring your ID card to the business hall for password modification.

The service password is the identification password of China Telecom's customers, which consists of a set of six Arabic numerals (each of which can be any one of the Arabic numerals from 0 to 9). It is set by the customer when entering the network or provided in the form of a password card. With the service password, the customer can obtain the corresponding services or products through various channels of China Telecom. Acts carried out through the service password authentication are considered to be the acts of the customer himself or herself or acts authorized by the customer himself or herself.