Since our switchover on Friday, a few people are unable to reach us (example from Belgium, Switzerland and also France). The message they get is : the number 0381xx is unassigned. Other people can reach the same phone number without any problem !
The call is lost/blocked before it hits our system.
It does not seem to be related to the geographical situation of the caller or the telecom operator of the caller.
The new telecom operator is investigating.