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How does Apple 5s import SMS?

1: Close the screen lock password.

2: Turn off "Find My iphone"

3. Use itools to export SMS to csv format, connect IOS7 devices, use iTunes backup management in iTools toolbox to back up the whole machine, then double-click the backup file that has just been backed up in this iTunes backup management, then double-click the sms.db file that comes out on the right after selecting SMS on the left, import the SMS backup file in CSV format that started to be exported, and then save and restore this modified backup.