How do you unlock an disabled iPhone that does not have sim card in it?

To unlock a disabled iphone without a SIM card, you can use iTunes or Finder. Connect the iphone to a computer where you have iTunes installed, or use Finder on macOS Catalina or later. Put the iphone into recovery mode by pressing the appropriate button combination for your model, then choose the "Restore" option when prompted. This will erase the device, allowing you to set it up again as new or restore from a backup.