100% free 200 min + 200m mobile calls and data from freedompop if you download their app !
after a £7 setup fee you can get 100% free 200 min + 200m mobile calls and data from freedompop but why do you have to download their app to get it ? if you dont want to use an app you try not 100% free but still good value giffgaff
https://www.flickr.com/photos/osde-info/21886126746/