This safety feature makes sense for international travelers, but online pranksters have unfortunately dicovered it, and are tricking people with social media posts like these:
Even though most hang up once they realize what is happening, these calls still tie up phone lines and occupy emergency service resources, endangering those calling on purpose who actually need help. Apple users are asked to refrain from voicing “211,” “999,” or “000” (other emergency service numbers) to Siri. Any voice variation of these numbers (like “two eleven” or “nine hundred and ninety-nine”) will cause a call.
However, users can feel free to ask Siri "What is zero divided by zero," which will result in a safe, humorous response. This inquiry will not result in any inadvertent calls, but it is sure to get a few laughs.
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