Type of pricing - what the average consumer rarely draws attention. In the description of any rate, this parameter is present, but more often in the list of footnotes in very small print. Per second, per minute, every second the second minute ... What, in essence, is the difference? If only minute talk was cheap, so these figures are all watching very closely. In fact, the type of pricing is an important parameter which largely determines the cost of a call. And we pay in the end it was a conversation, not specified in the tariff, "minutes".