I'm using Zoiper for my US number. I'm based in the UK and need this number for business. I need it urgently at the moment.
Two weeks ago the number was not registering and I ignored it because I was busy and did not need the number. The point here being that it started working again without me making any changes.
I don't have days to wait for this to change again.
The error message...
(Registration failed (temporarily unavailable (480))