iPhone:

  1. Go to the iPhone Home screen 

  2. Go to 'Settings' app > 'Passwords & Accounts' 

  3. Tap 'Haystack'

  4. Toggle account to 'off'

This will be remove all Haystack cards from your phone contacts.

Android:

  1. Tap on the 'three lines' at the top > Settings

  2. Toggle 'Contact Syncing' to be off

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