Admin Lock was applied even though the SIM card was not replaced
In LOG in the admin console, check whether the message The SIM card of the device was replaced. Phone number (none) is displayed for the device.
If the message shows Phone number (none) even though a SIM card is actually inserted in the device and it has a phone number, the device failed to send the phone number information to the server correctly.
A possible cause is that multiple processes were running at the same time on the device, for example right after startup, or right after an OS update or restart.
Because the registered device information (phone number) does not match the information that was sent (no phone number), the SIM card change detection feature judges them to be different and applies Admin Lock.
To release the lock, see the following manual.
Manual: SIM Change Detection
In addition to releasing it manually, if you specified Release by administrator, or reinsert approved SIM card in the template settings,
you can release the lock by reinserting the same SIM card and then syncing the device.
Last updated: July 20, 2022