The mobile phone received a short message with an unknown number. How can I find the original number?

First of all, how long has your mobile phone number been out of service? The number is time-limited. If it is long, it will automatically stop and become someone else. If it's not long, put the original card on your phone. It is estimated that your mobile phone number has been shut down, so this message can't be received at all. 10086 No way.