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Re:Huawei 5G kit must be removed from UK by 2027 by mattmanser on Tuesday July 14, 2020 @06:20PM (#23838748)
I assume in order to be able to decide to serve those 1Ghz frequencies, all the phones are going to ping the local towers regardless, so it doesn't matter.
Re:Huawei 5G kit must be removed from UK by 2027 by opless on Tuesday July 14, 2020 @08:44PM (#23839934)
That'll no doubt be down to the configuration of the terminal device. It'll likely only TX on the available bands allowed in the devices home region for licensing/compliance issues.

Back on the tracking side of things...

AFAIKR 3G and above do not leak their IMEI/IMSI unencrypted. Of course nearly zero phones show or warn if encryption is used or not (though I think that's a setting in the SIM card).