I have United Mobile UM+
In the last 2 weeks it has NOT worked in:
New Zealand
Estonia
Latvia
Lithuania
Slovakia
Romania
Bulgaria
Serbia
Croatia
Slovania
It has worked in:
USA
Canada
Aruba
Sweden
Hungary(?)
Poland
Italy
France
Spain
I have not read the 30+ pages of this thread
Does this list match others experience?
Also I am having sporadic luck with
www.callbackworld in combination with United Mobile