How to export SMS content from broken screen of mobile phone?

The maintenance man was right.

However, if you log in Xiaomi account on your mobile phone and start the cloud service, your contacts, short messages, call records, photos and other information will be automatically backed up to cloud hosting under wifi. You can log in to i.xiaomi.com to find out!

Log in this account ~ millet cloud service in the settings of the mobile phone, and then turn on the corresponding synchronization' to automatically synchronize to the mobile phone!

The cloud photo album can be viewed in the mobile phone gallery of this account!

If you don't use cloud services for synchronization and backup. Then you can't get it back.