There is no monthly recurring charge to use AT&T Messages Backup & Sync.
Your messaging plan rates apply for all sent and received messages whether you use the service or not. There is no additional per-message charge for message backup.
For customers that opt into the service, all sent or received messages are automatically copied to the AT&T cloud for no additional fee.
Data charges may apply for the synchronization of your messages to the AT&T cloud including:
- Initial sync of messages between your smartphone and the cloud
- Ongoing sync of message read and delete status between the smartphone and the cloud
- Delivery of messages sent from a tablet or computer to your smartphone
Message sync that occurs over a Wi-Fi network will not incur data charges.