How should I comment on a call from Ukraine in Moments?

You can comment and wish peace and the like.

The caller ID service is a service that can automatically display the number of an incoming call on the display screen of the telephone, so that the caller's phone number can be known in advance.

"Caller ID" is also called "Caller ID Display" (CallingIdentityDelivery). It is divided into two types: one is the on-hook state (onhook), that is, when user A calls user B, user B's phone can receive the phone number and other information of the calling party user A from the switch and display the phone number.

The other is the offhook state, that is, when users A and B are talking, user C calls user B. When B hears the prompt tone, he can also receive user C's phone number. At this time, Person B can choose the person to call as needed.