Apple iPhone 4 Ad Highlights Both US Carriers / 10-Billionth App Downloaded Through iOS App Store / 10 Billion iOS Apps: SAI Plays with Numbers / 10-Billionth App Winner Hangs Up When Apple Calls / Nuance Opening Dragon Mobile SDK to iOS and Android Developers / Apple Replacing Phillips Screws on Repaired iPhone 4s with Security Screws / Rumors Have Apple Hiring Serious Security Guy / iOS 4.3 beta-Probers Find Reference to 1MP Camera for iPad / Toshiba Ridicules Lack of Flash-Support on iThings / SF MUNI Bus Stops Host Citywide Video Game Competition