So George Francis Hotz has an Xperia X10... I finally understand that this is not a Smartphone - It's a microcomputer with a cell phone app I have now installed AntiVirus Free 2.1 [aka DroidSecurity AntiVirus now owned by AVG?] <http://www.droidsecurity.com/> on my X10i. Too early for me to tell if performance of the phone is affected in any way - seems to be working fine. Has anyone tried any other anti-virus apps?