There's been at least one similar app around in the US for probably seven or eight years. Mr. Number is its name, although I believe it originally had a different one.
Edit: July 2010 release, 10M+ downloads, nearly 200k reviews. From long ago memory seeing names that have been submitted may be a paid subscription option.
Edit: July 2010 release, 10M+ downloads, nearly 200k reviews. From long ago memory seeing names that have been submitted may be a paid subscription option.