My iPhone settings are not showing Siri

I have an iPhone SE with iOS 10.3.1. The Settings app does not show the Siri option. I want to enable Hey Siri and I have restrictions disabled.

Here are some screenshots:

Settings View

Inside General Settings

Inside General Settings Scrolled

Inside General Settings bottom

How do I enable Hey Siri?

Solution 1:

This works for iOS 11 and earlier (Restrictions were changed in iOS 12):

The easiest way to get Siri back (without doing a Soft Reset or Reset All Settings), do this:

1. Go to Settings→General→Restrictions
2. Enable Restrictions; give it a password.
3. Disallow Siri & Dictation.
4. Return back to General settings.
5. Go back to Restrictions, putting in the password.
6. Allow Siri & Dictation. Go back to Settings and Siri & Search should now be available.
7. Disable Restrictions.

This worked on an iPhone 6s Plus on iOS 11.2.5.

Solution 2:

This issue persists after updating to ios 11 also, so I just did a reset all settings and Hey Siri option came back.

PS: the reason I did reset all settings as because springboard kept on crashing almost everyday which became annoying.