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).
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).