What is the caller ID function of China Unicom?

For example, Hubei Unicom's "incoming call treasure" function: when the mobile phone is turned off or out of service area, it will keep missed calls. After the communication is restored, the system will send a short message to inform the missed number within 24 hours.

Hubei Unicom's incoming call treasure is charged according to the article, and each short message with missed incoming call number is charged at 0. 1 yuan, which is capped in 8 yuan every month.

Tips:

1. If the same user misses the call for many times, he will be reminded by SMS for many times and will be charged;

2. When you dial the phone of the user who has turned on the caller ID, you will hear a voice prompt. No surgery, no charge.