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No, whitelisting is not just used for that context, nor telephony industry in general.

It's just a general English term to signify the inverse of blacklisting.

For example a local country club...

For example, I never use T&T from the cellphone provider , only Data service, all my T&T is via VoIP.

So if I have a very low allocation of data on my plan, with a 100% cutoff once that is all...