What does it mean to receive a notice from a foreign visitor that the mobile phone is maliciously owed?

This mainly refers to the mobile phone products used before. If the arrears have not been paid for more than 3 months, or have enjoyed preferential treatment such as telecom or mobile, Unicom mobile phone and telephone charges. , some users agreed in the online agreement but failed to perform the contract, and failed to pay the arrears within 7 to 15 days after receiving the notification methods such as SMS, outgoing call, door-to-door visit and email. The above refers to the malicious arrears of the mobile phone after receiving the SMS notification of foreign visits.