If the phone number that called him doesn't exist, what's the matter of sending him a text message to show that it was sent successfully, and charging him a phone bill but not returning it?

If the other party is Unicom's mobile phone number, dialing the other party's phone number will prompt that it does not exist, the phone bill will be recharged, and the fee will be returned to your account, indicating that the other party's number is likely to have been cancelled;

If you need to check whether the other party's Unicom mobile phone number has been cancelled, you can call the Unicom manual customer service where the number is located. Because business policies vary from place to place, can I check them for you on the basis of local business policies?