How does China Mobile detect the use of my mobile phone? Return charge

If you have participated in an event, there was a mobile phone serial code in your mobile phone when you participated. The business office tied the mobile phone serial code and the mobile phone card together when you participated, and the system monitored it through this serial code. Whether the machine and card are separated, so if you have participated in the event and do not separate the machine and card before the expiration date, you will definitely be able to check

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