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How to determine a federal number from a short city number?
As you know, cellular operators on some tariffs provide the opportunity to use a short city number along with a full federal number. Therefore, the question is: how can you determine the federal number from the city? Naturally, this should not be done manually and not for one or two numbers.
Perhaps there are any services or up-to-date operator bases for this with indications of the relationship between city and federal numbers?
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