The newest Android phones use the Qualcomm Snapdragon 855 chipset with its TrustZone/TEE. The Android OS makes sure that a stolen phone, in its assembled form, is not usable.
Does Trustzone further prevent the CPU from being removed from a stolen phone and used in any way? I see how Qualcomm could lock the CPU (e.g., with a PIN or a fingerprint), but I also see how this could be dangerous for hardware development so I suspect that Qualcomm would allow some reset/unlock mechanism.
I'm basically wondering if there is any phone with anti-theft features preventing the CPU from having any stolen value. If not Android, what about iPhone?