I imagine it's world wide. Here's a link showing the iphone is 100 million sales ahead of sammys top line phones
bgr.com/2013/01/17/iphone-sales-comparisons-samsung-294236/?utm_source=feedburner&utm_medium=feed&utm_campaig n=Feed%3A+TheBoyGeniusReport+%28BGR+|+Boy+Genius+R eport%29&utm_content=Google+Reader
That graph doesn't include the the first 3 iphones aswell so I image its a lot higher. Also shows the S3 and i5 on level pegging now.