How do I get Siri back on my screen?

Just say "Hey Siri" or press and hold the home button.

Link-> Ask Siri on iPhone - Apple Support

ingelise113 Said:

"How do I get Siri back on my screen to ask questions?"

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Reset the Home Screen Layout:

If a widget has gone missing somehow, then you need to reset the Home Screen Layout...

Go Here: Move and organize apps on iPhone - Apple Support

Note: You'd have to add back all the widgets that you can recall being back on there. So, make note of them.

Scroll to: Reset the Home Screen and Apps to their Original Layout

1. Go to: Settings
2. Tap: General
3. Tap: Reset
4. Tap: Reset Home Screen Layout

ingelise113 Said:

"How do I get Siri back on my screen to ask questions?: Thank you very much! You’re a genius”

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You are welcome.