We are aware of a situation that can occur whereby a range is imported for an end user, but then subsequently reused by the CP for another end user once the original end user has terminated their service. For example, an end user terminated service with their CP without porting the numbers elsewhere and the CP has reused some or all of those numbers.
Re-using ported in numbers in this way is prohibited under the industry porting guidelines and so you should take care to ensure this doesn’t happen on numbers that you have ported in for an end user. Once an end user has terminated service on their numbers, one of two things should happen. If part of a range is no longer in use, the unused numbers should be quarantined as they cannot be re-used. If it’s a complete range that is no longer in use, these should be returned to the range holder – we can arrange for this to happen if you email email@example.com. We perform regular audits of numbering to make sure that where ported numbers have been deactivated, they are returned to the range holder where possible but if you can flag these to us as well that is really helpful!