How to check whether the empty number is used, and how to call 100 10 for manual customer service consultation?

You can dial the number of the other party. If you can't get through, you will be prompted "No number", and this number is empty.

You can go to the nearest Unicom business hall and ask the salesperson to confirm it for you.

You can call Unicom's customer service phone number 100 10, and ask the hotline customer service representative to confirm it for you, but you can only confirm whether the number is used, and you can't provide any information about the other party's number.