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How do I retrieve deleted messages from another phone on my account?
How can I restore the messages from my backup?
If you have an iPhone, you can restore the messages by going to Settings > General > Reset > Erase All Content and Settings > Restore from iCloud Backup. If you have an Android phone, it may vary depending on the brand and model, but you can usually restore the messages by going to Settings > Backup and Restore > Restore.