Have a look at the step-by-step instructions given below to see how you can set up Siri on your iOS device.
Step 1: Open Settings on your iPhone or iPad.
Step 2: Tap on the Siri & Search option in the Settings Menu.
Step 3: Turn on the “Listen For Hey Siri” button to continue with the Setup process.
Step 4: Press Continue and say Hey Siri into your iPhone.
Step 5: Say: “Hey Siri, send a message.” to continue with the setup process and repeat the other commands it asks you to say.
Step 6: Press Done when you’ve said all the commands and that will complete the Voice Recognition process. Now every time you say “Hey Siri” you’ll be able to bring up Siri on your iPhone or iPad.