Samsung s7 just updated the system, and suddenly contacts and text messages can't be used.

Suggestion: 1. Restart the phone. 2. Check whether it is hidden: Please go to Applications-Menu Button-Show Hidden Applications. 3. You can check whether the mobile phone is in safe mode (the word "safe mode" appears in the lower left corner of the mobile phone screen) and whether the application icon appears after restarting the mobile phone to exit safe mode. 4. Check whether the application is closed: Go to Settings-Applications-All-Look for the required application carefully-Open, click Open, and then go back to the application to see if there is an icon. 5. If it still can't be displayed, please change to another platform and download the observation again. 6. Please back up the data in the mobile phone, and then restore the factory settings (Settings-Reset-Restore the factory settings). Through the above methods, the problem still exists. Please bring the purchase invoice, maintenance card and machine to Samsung Service Center, and the engineer will check and handle the machine.