Hello Agneta,
Thanks for reaching out to Microsoft Q&A forum support.
From your description, I understand that you want to be able to port out your Skype number to a different service provider. I will be assisting you with a few steps to do that.
In order for you to be able to port out your Skype number to a different service provider, you need to reach out to the intending service provider and let them know. They will request for a few details about the Skype number from you and then they will proceed with your request.
Kindly refer to the link below for more information about Skype number:
I hope this helps.
Best regards,
Happiness | Microsoft Q&A Support Moderator.