Doesn't the whole SIM architecture exist so that phones don't have to be trusted? I believe IMEI can be anything in practice, so long that there isn't a blatant duplicate nearby, a bit like Ethernet MAC address. I don't know if it's legal but phone nerds seem to be editing IMEI all the time for non-Apple phones as well, using those leaked vendor tools.
It used to be that when the telco detects an IMEI change for your SIM, they send a configuration over the air so that you have access to the data network.
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Doesn't the whole SIM architecture exist so that phones don't have to be trusted? I believe IMEI can be anything in practice, so long that there isn't a blatant duplicate nearby, a bit like Ethernet MAC address. I don't know if it's legal but phone nerds seem to be editing IMEI all the time for non-Apple phones as well, using those leaked vendor tools.
It used to be that when the telco detects an IMEI change for your SIM, they send a configuration over the air so that you have access to the data network.