Apple fixed a bug that crashed iPhones configured in certain ways whenever they typed the word "Taiwan." The glitch was discovered by Patrick Wardle, chief research officer at Digita Security and outlined on his blog.
The details: China is touchy about representations of Taiwan as an independent nation, so Apple removes the Taiwan emoji from phones set for the Chinese region. But in certain situations, it also incompletely removed it from phones set for other regions. When those phones tried to access the Taiwan emoji that was suggested any time a user typed Taiwan, the phone crashed.