The surest way to reduce the likelihood of a port rejection is to obtain a Customer Service Record (CSR) from your current carrier. A CSR is a copy of how your telephone record appears in the carrier's database. This document provides a record of service information on file with the underlying/originating service provider and contains the information necessary to establish your right to port the phone number, including the authorized parties and the address.

The CSR can be particularly helpful when your carrier is reselling the services of another underlying carrier.  In cases where you are buying services from a reseller, your telephone bill may not contain the same information as what has been recorded by the underlying carrier in the CSR.

In order to ensure a port request’s likely success, the information on the Letter of Authorization (LOA) – particularly the authorized user, service address, and zip code – should exactly match the information on the CSR.