Can’t turn on Siri after update

To fix standard Siri not turning on after an update, go to Settings, tap Siri (or Apple Intelligence & Siri), select Talk & Type to Siri, and toggle the switch off and back on again. 

If you are trying to enable the advanced Siri AI (Beta) features and cannot find or turn them on with a standard iPhone 15, there are specific hardware and regional restrictions to keep in mind: 

• Device Compatibility: The standard iPhone 15 and iPhone 15 Plus do not support Siri AI; you need an iPhone 15 Pro, iPhone 15 Pro Max, or a newer generation. 
• Regional Restrictions: Siri AI is not available in the European Union or China at launch, which affects devices used in those regions. 
• Language Settings: Your device and Siri language must be set to English (US).
• Basic Reset Steps: If standard Siri is simply frozen or unresponsive, try restarting your iPhone or resetting your network settings via Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings.