Identifying phone brands with base stations case
Modifying an IMEI cannot prevent the base station from identifying your phone brand. In fact, the base station can obtain your phone brand, model, and current system through many UE to network signaling fields such as IMS SIP REGISTER. For example, in the IMS SIP REGISTER signal, the phone sends its own brand as User Agent to the base station. There was once a big deal that used this signal, which lawyers were afraid of, so I won't say more.
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