What do these undocumented mobileNetworkCodes from CTCarrier mean?

I noticed that sometimes CTCarrier.mobileNetworkCode returns undocumented values. Examples below:

  • Is VZW Verizon?
  • "" (empty line) instead of nil, when the device does not have a SIM card installed or in AirPlane mode - it looks like an error.
  • Is "65535" some special meaning that means something?

What do these specific undocumented codes mean?

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