Advertising for Blackberry comparing the thickness and functionality of a wallet to the said device.

Why do so many American males carry their mobile phone on their belt? Why do so few American males carry their wallet attached to their belt? How does the position of the mobile phone shift when phone functionality includes a variety of payment options? How does the position of the wallet shift when phone functionality includes a variety of payment options? And from a security stand point – assuming someone was trying to scan/hack what is on your phone or in your wallet, how does the method of attack and likelyhood of success change according to these shifts in behaviour?

Related: Where people carry phones and why.