Siri will work even without internet on your iPhone with iOS 15
Apple is taking Siri offline with iOS 15. At the WWDC, Apple announced that Siri will now be able to recognise speech and process many requests on-device without needing an internet connection. Similar to how Google Assistant works for device-oriented tasks such as turning on the flashlight, Siri on your iPhone will begin taking such orders and not need the internet for them.
iOS 15 is now available to download as developer beta on a number of eligible iPhone and iPod devices, starting right from the iPhone 6s. A wider release, however, will happen around the iPhone launch in September.
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