In foreign countries, mobile phones have no arrears and can't receive short messages.

International roaming problem, mobile phone setting problem, mobile phone card problem.

1. International roaming problem: If your mobile phone has international roaming service, you may receive short messages abroad. However, if the network signal in your country or region is poor, it may affect the reception of short messages.

2. Mobile phone settings: If your mobile phone is set to intercept short messages or the short message storage is full, it may also lead to the inability to receive short messages.

3. Mobile phone card problem: If there is a problem with your mobile phone card slot, or the mobile phone card itself has a weak reception signal, it may also affect the reception of short messages. You can try the following solutions: check the mobile phone settings: check the SMS interception settings, empty the SMS inbox, and ensure that the mobile phone signal is good. Replace the mobile phone card: If there is something wrong with the mobile phone card, you can try to replace it with a new one. Contact the operator: If the problem still cannot be solved, you can contact your mobile phone operator, and they may provide some solutions.