As long as it hasnt been over 30 days since you deleted the contact, it should still be in your trash. But here's a directory- Contacts App>Three Lines in Corner>Trash>Click on Contact you Want>Restore (at bottom)
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I think you may have to enable the sound or vibration yourself if that's what you're talking about. If we're talking about the same thing, follow this path to enable vibration/sound for WEA. Settings>Sounds and Vibration>System Sound/Vibration Control>Emergency Tone>Alert
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