Many iPhone owners are wondering whether they should follow the iTunes prompt and update to iOS 4.3.4 or not. There are a few questions you might ask yourself before making this decision to help determine if the 4.3.4 (4.2.9 on Verizon) firmware update is for you. Skipping the update leaves your device at iOS 4.3.3 or earlier, which could be useful down the line.
First it's important to understand what Apple is trying to accomplish with the iOS 4.3.4 update. The primary purpose is to fix a PDF security vulnerability on your iPhone. This may sound bad, but read on for more details. This vulnerability is the same weakness that makes the remarkably easy and fast JailbreakMe 3.0 procedure possible.