Do you feel comfortable making a payment or any other type of financial transaction with your smartphone?
Interesting article about this topic...
http://www.creditcardeducation.com/commentary/risks-and-benefits-of-using-smartphones-to-make-payments.html
Here is a white paper from Infineon about "security on NFC enabled platforms" that is on electronicproducts.com
http://www2.electronicproducts.com/Security_on_NFC_Enabled_Platforms-article-WPJF_Infineon_Security_Platforms_04112012-html.aspx