If you are interested in mobile communications and its growth, I can recommend watching this facts and statistics-based video by Sybase.
Some of the amazing facts included in the video:
1964 Motorola launched the first car phone
1973 The first handheld phone came to market for $3,995
1992 The first smartphone was launched.
2009 1.2 billion mobile phones were sold
To back this up I have included another, slightly older video with additional insight into the growing world of mobile communications.