If you happen to own a smartphone, chances are pretty high that you will fall under one of the four categories – iOS, Android, BlackBerry OS or Windows Phone 7. Just what kind of inference can you get from this three different groups of people? Well, data collected by personal finance service Pageonce does point towards the average iPhone users charging around $6,872 to their credit cards each month, while the typical Android user is slightly more frugal at $5,330 monthly. Sandwiched between iPhone and Android owners would be the BlackBerry crowd with $5,693 monthly, and the no-brainer for the last place would be Windows Mobile users – who use a mere $5,076. That’s pretty high when you think in terms of average income.