The error caused the iPhone to hang temporarily with just one voice
When saying “hyphen” more than three times, the iPhone immediately crashes and then switches back to the lock screen.
The error-prone iPhone is usually activated with Dictation – Spelling reading (users can go to Settings> General settings> Keyboard> Read spelling to turn on / off).
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To try, users open the iPhone to the main screen, swipe left, then tap the microphone icon and then say the word “hyphen” repeatedly more than three times. When speaking, the keyboard language must switch to English. Experiments show that iPhones running iOS versions 11 and 12 (including the latest iOS 12.1.4) are affected.
Error occurs when voice input, while still normal if using virtual keyboard. There is currently no way to thoroughly fix this problem, except temporarily turn off the dictation feature.
This is not the first time iPhone has problems importing text. In 2015, some discoverers could freeze the iPhone by sending an uncommon Unicode string to another device. Earlier last year, some iPhones were also suspended when receiving messages containing a letter in the Indian language. Usually, Apple will fix the problem with a new update.
Image source: cultofmac.com