Some features in setting in which I don't know what is the use for it

[Integrationofmind]

In setting app, there are some features in which I don't know what is uses for this .

1. Backup calling 

2. Call and text on other device 

3. Quick share ( maybe new name of nearby share) 

4. Dex 

5. Ultra wide band 

6. Smart view 

7. Wifi sharing in mobile Hotspot 

8. Theft protection ( which was available after updating Google play)