Et, effectivement, je confirme qu'ils sont très joignables et très sympathiques :

Dear customer,
The fact that they are ported does not effect the delivery. We have performed some tests and have successfully been able to deliver to these numbers now. Our routing has therefore been updated now and it should start working for you on FishText within the next hour. Please test and let us know if it works. Once again we apologise for the inconvenience and thank you for your patience.