I have a mobile phone number, which has been useless for a long time. Today, China Mobile suddenly sent a text message saying that it was in arrears, and someone answered my call. What happened?

If you haven't used this mobile phone for a long time, at least 3 months. Did you throw away this card? First of all, is the arrears information your current mobile phone number or your previous mobile phone number? If you throw it away and someone else finds it for use, then this message should not be sent to your mobile phone. If it has been abandoned for a long time (about 1 year), then your number may be reused, which can explain the situation that you said the callback was answered. If these two contradictions are put together, then you must first confirm the information, content and sender. If you have already thrown it away, leave him alone.