Why do I send my mobile phone to the same person, but the other person often receives two identical short messages? I only sent it once? My card is a fixed line width bound by Unicom.

Hello, this situation should be rare. Usually this situation is caused by network reasons. When sending this short message, the short message platform will delay sending when the network is weak, and may receive two duplicate short messages at the same time when recovering. Strictly speaking, this situation can only charge the sender 1 SMS, and there will be no repeated charges. You can log in to Unicom's online business hall or download Unicom's mobile phone business hall client on your mobile phone, and click "Call Charge"-"Detailed Bill Inquiry"-"SMS/MMS Detailed Bill Inquiry" on the left side of the home page to check the charging status of newly developed SMS, which should be charged according to 1

Enquiry location of mobile phone hall: Home-More Inquiries-Detailed Inquiries-SMS/MMS Detailed Inquiries.