1. Security researchers have discovered a vulnerability in iOS that allows an iPhone to be "killed" with just a few taps. The vulnerability involves a 4-character code that, when entered into the device's phone app, can cause the device to become unresponsive and potentially require a factory reset to restore functionality.

2. The vulnerability is believed to be related to the way iOS handles certain types of phone numbers, and it appears to affect a wide range of iOS devices, including the latest models. The researchers responsible for discovering the vulnerability have reported it to Apple, but it's unclear when or if a fix will be released.

3. While the vulnerability is concerning, it's important to note that it requires physical access to the device and the ability to enter the 4-character code. As such, it's unlikely to be a widespread threat, but it does highlight the need for continued vigilance and security updates from Apple to address any potential vulnerabilities in the iOS operating system.