When looking into Telnyx rate sheets to check for a call price you'll see the Destination Prefix column. While call pricing often involves simply the preferred number prefix in that column, some numbers use a different Location Routing Number (LRN), which can lead to confusion.

Call rates are based on the Location Routing Number (LRN), not always the number you dial. In rare cases where they don’t match, the LRN destination prefix is what determines the cost.

The LRN of a number can be found using the Lookup tool in the Mission Control Portal. Simply enter the number, and the tool will return the associated LRN prefix. This prefix should be used to determine the correct rate on the Rate Sheets.

For instance, numbers with the prefix +1 941 529 have an LRN beginning with +1 813 568. Since rates are based on the LRN, the applicable pricing is listed under the +1 813 568 destination prefix, not the original number.