What does the telecom trumpet of Tianyi Security Center refer to?

China Telecom trumpet is a product designed for your privacy and non-interference needs. In addition to your existing mobile phone number, you can also apply for Tianyi number, and you can use two numbers in different scenarios without adding a mobile phone card.

Your existing mobile phone number is called the main number, or the main number for short. The number added when handling trumpet business is called trumpet. Trumpet can't handle any business alone, only call and send text messages.