How to set up voice call service in mobile phone client?

There are three kinds of mobile phone clients, mobile, telecom and Unicom. Here, let's take telecommunications as an example to briefly introduce:

1. Call the customer service hotline 10000, handle the related business according to the voice prompts, directly switch to manual, tell the customer service staff the type of business you want to handle, and provide the customer service staff with identity information before handling the corresponding voice call business.

2. Bring your ID card to the mobile business hall to handle related business.

3, through the online mobile business hall for voice call signing business.