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Can China Mobile and Telecom check my mobile phone model by texting or calling?
This can't.
In the era of GSM(2G), when you make a phone call or send a text message, it is sent together with your mobile phone serial number and mobile phone SIM card number. The specific reason is unknown. Because of the problem of wireless communication system, the operator knows that the model of your mobile phone (which can be verified by serial number) is normal.
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