How to judge whether the number is blacked out or not?

Texting, using social media, checking phone records.

1. Send SMS: Send SMS to the other party, the SMS can be sent normally and the receipt can be received, and the number will not be blacked out. After sending a short message, there was no receipt for a long time, and I received a prompt of "sending failed", and the number was blacked out.

2. Use social media: Check whether the other party has updated the news on the social media platform. Can see each other's latest developments, the number has not been hacked. Unable to view, received a "unable to view the other party's dynamics" prompt, and the number was blacked out.

3. Check the phone records: Check your own phone records. If you have a call record with the other party, you can't dial, and the number is blacked out.