what this icon mean on my sony phone?

[S1S4SM1T4]

i don't know with this icon, after i reset my phone
this icon come out

 

[mhinc]

i don't know with this icon, after i reset my phone
this icon come out

That symbol represents that the data saver is on.

Data saver prevents apps from accessing network in the background (when you are on mobile network, and not on Wifi), and saves you precious mobile data and battery. Go to quick settings and toggle the data saver switch if you want to turn it off.

 

[S1S4SM1T4]

and what happen to my front camera if mean like this

 

[mhinc]

and what happen to my front camera if mean like this

Maybe it's because you still have Data Saver on? Try turning off Data Saver and rebooting and see if it's still effecting you front camera.

Either way as suggested it thinks the camera is being used by another application. Maybe start up in Safe Mode and see if it still gives the same error as well