Go to Settings > Siri and make sure that Siri is turned on. You need an Internet connection through Wi-Fi or cellular data. Cellular data charges might apply.
Ask Siri a question
There are several ways to talk to Siri. To see a list of what you can ask Siri, press the Home button and ask "Siri, what can you do?" Or press the Home button, then tap the question mark in the lower, left-hand corner of the Siri screen. Learn more about what you can ask Siri.
Use the Home button
Hold down the Home button until Siri opens, then say what you need.
If you have an iPhone 6s or later, an iPad Pro 12.9-inch (2nd generation), an iPad Pro 10.5-inch, or an iPad Pro (9.7-inch), you can say what you need as soon as you press the Home button. Siri listens while you press the Home button and responds even if Siri wasn't on the screen when you started.
Say, "Hey Siri"
You can use Siri without pressing the Home button. First, make sure that "Hey Siri" is on under Settings > Siri > Allow "Hey Siri." Then say "Hey Siri" and ask your question. For example, you can say "Hey Siri, how's the weather?"
If you have an iPhone 6s or later, an iPad Pro 12.9-inch (2nd generation), an iPad Pro 10.5-inch, or an iPad Pro (9.7-inch), you can use "Hey Siri" whenever you want. If you have an iPhone 6 or earlier, or another iPad or iPod touch model, you need to plug your device into power first.
Talk to Siri with your headset
If you're using a headset that has a remote or another type of Bluetooth device, hold down the center button or call button until you hear a chime. Then say what you need.
If you have AirPods, double-tap the outside of either one to activate Siri.
Talk to Siri in your car
In addition to using "Hey Siri," if your vehicle supports CarPlay or Siri Eyes Free, hold down the voice-command button on your steering wheel, then tell Siri what you need. Siri waits for you to stop talking. If you have a touch screen with CarPlay, you can also use Siri by pressing and holding the Home key on the screen. You can tap the audio-wave button to tell Siri you're done talking. This is useful if Siri can't hear you because there's background noise. Opening certain apps like Phone or Messages can also connect you to Siri.
Siri adapts its behavior depending on how you're connected. For example, if you're connected from a wired or Bluetooth headset, from Siri Eyes Free, or from CarPlay, Siri reads your messages so you can approve them before sending.
Change Siri’s voice or language
To change Siri's voice, go to Settings > Siri > Siri Voice. To change Siri's language, go to Settings > Siri > Language. Then choose from the list of languages that Siri speaks and understands.
To change how Siri responds, go to Settings > Siri > Voice Feedback and select an option.
You can use Siri in any country or region, with any of the supported languages. Since Siri is designed to recognize accents and dialects of the supported countries or regions, Siri's accuracy rate will be highest for native speakers. Learn which Siri features are supported in which countries and regions.
Have phone calls announced
The Announce Calls feature is off by default, but you can turn it on and adjust it under Settings > Phone > Announce Calls.
You can have all incoming calls announced, only calls when you're in the car or using headphones, or only calls with headphones.