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You are aware of it.

They always have a well known prefix, in the us its 1-900, in the uk its 0871.

..unless you're not, since you don't know the magic prefix of the country in question.

There is a lot of variety https://en.wikipedia.org/wiki/Premium-rate_telephone_number

Well, yes, it is up to you to check beforehand what certain things cost in different countries. Do you want countries to post signs with their exact speeding fines at borders?

Ideally I could charge anybody any amount to call me. Not a timed rate but cash just to get through. I could charge nothing for my friends, family, building doorbell service, and everyone else I approve, and $10k for everyone else. If robots fail to determine that charge that's on them.

Fyi, calling normal phone numbers costs your carrier anywhere from $0.05 to $0.00007 per minute in the US for normal numbers. The more rural a number is, the higher the cost