Just FYI, if you port a number away from any voip service, you'll almost always need to call and cancel the service after porting.

This is because the voip service is a "service provider", not so much a "carrier". The porting is usually done at the carrier level, and the voip service will likely be totally unaware that the number has been ported at all.

Be sure to call and cancel, but also instruct them to remove your number from their network. Otherwise, other people using the old service may experience problems when calling your number.