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How To Use Google Backup And Sync
From the Messaging application on your smartphone, select Settings, AT&T Messages Backup & Sync, then choose Stop Backup. Log in to att.com/myatt or the myAT&T app and remove AT&T Messages Backup & Sync from the mobile number that has the Service. Call AT&T Customer Care at 800.331. 0500 or 611 from your mobile device.