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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?

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