Any updates made to a Haystack card will instantly update in your phone contacts

This is a one-way sync from Haystack to your phone's contacts. This sync does not share your phone contacts with Haystack

This feature is ON by default but can be manually turned ON or OFF in the app settings

If you turn OFF contact sync, all Haystack card details will be removed from your phone contacts

Haystack does not sync your phone’s contacts into the app—only Haystack card details are synced to your phone. If you wish to see which of your phone contacts can be added to Haystack, use the 'search phone contacts' option in the settings menu