Undocumented SIM States in TelephonyManager

Question

I'm working on an application where I want to read the SIM State, and I've been following along with Google's documentation on getSimState.

Some of my users are returning values that are not referenced by a constant in the documentation listed. For example, I am getting 13 and 14 back. Any idea about these values or other undocumented, hidden SIM states that could be returned?

FWIW, I do believe these devices might be carrier locked, although I would expect SIM_STATE_NETWORK_LOCKED to return in this instance. I have one locked device where I can replicate this but I would love to know specifically why a different state is returned.