The Rate Sheet and LRN explained
When looking into our rate sheets to check for a price of a call you'll see the Destination Prefix column. Most people would think that checking the price of a call is as easy as matching the prefix with the called number, and that would be true for most numbers but there are some numbers where their LRN (Location Routing Number) is actually a completely different number and confusion might arise.
Finding the LRN and Determining Call Costs
The LRN is what the rate sheet is actually based of, not the called number itself. So in the rare cases where a number does not have the same prefix than their LRN, the correct number to use to determine the cost is not the number itself but the LRN.
How then would you find the LRN of a number? With our Lookup section of the Mission Control Portal. You just need to supply the number and we'll return the prefix for the LRN of the number. Then you can use that to look for the correct pricing of the calls on our Rate Sheets.
An example of this is the numbers with Prefix +1941529. Their LRN is actually +1813568XXXX which as you can see has a completely different prefix. When looking at the rate sheet you would see two different prices for those prefixes, the correct price for a call to a number with the prefix +1941529 is actually the one on the rate sheet under the prefix +1813568.
You can read more about how to use our Lookup tool here.