HTC One User Manual page 171

Restoring text messages
You can only restore text messages that were exported using the Back up
SMS feature.
1. Open the Messages app.
2. Tap > Back up/Restore SMS > Restore.
3. Choose how you want to restore the messages, and tap Next.
4. Tap the backup file to import.
5. Tap OK.
Backing up text messages by email
You need to set up your email account in the Mail app.
1. On the Messages screen, tap
2. Tap Back up > Back up SMS via mail.
The backup file is attached to an email.
3. Enter your email address.
4. Compose your email message, and then send it.
To restore your text messages to HTC One, open the email message with
the backup file attachment from the Mail app. Tap the attachment to
download it first, and then tap it again to open the backup file to import.
Sync, backup, and reset
> Back up/Restore SMS.
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