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Most ID numbers are used as weak authentication: Driver's license numbers, SSNs, etc.

The security on a ICCID is arguably better than any of these things. Unless it's transmitted in the clear? I don't know.

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It's an ID, not an authentication token. If it helps, you can think of it as a username, not a password. It has to be transmitted in the clear or you wouldn't even know who you're talking about.

Doesnt have to be transmitted in the clear; that's exactly what TLS does; allows usernames and passwords to be transmitted with encryption so only the other party can recover them.

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