Welcome to the Community Forums! Thank you for sharing your question in regards of the AT&T Address Book feature. It will be my pleasure to help!
To disable the automatic sync option from your phone, please follow these simple steps:
Open Address Book/Contacts
Tap on Menu
Uncheck the Automatic Sync option
Restart your device and make sure automatic sync has been disabled successfully.
In addition, keep in mind AT&T is retiring this feature. You will receive SMS notifications 60 and 30 days in advance before this service shuts down. To learn how to export your contacts, please follow this link.
I hope this information helps! Thank you and have a nice day!
Anabel, AT&T Community Specialist
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