Is my grammar true ?
Hello ,
I have Questions of my studying its about uses of smartphones and my answer is :
It is use of :
Calling
Surfing Internet...etc
Is it true for adding "ing" to a verb ?
If I have any mistake of any things tell me thank you.

Question

Is my grammar true ?
Hello ,
I have Questions of my studying its about uses of smartphones and my answer is :
It is use of :
Calling 
Surfing Internet...etc
Is it true for adding "ing" to a verb ? 
If I have any mistake of any things tell me thank you.

Answer

I have questions  in my study about the uses of smartphones and my question is :
It is use of :
Calling
Surfing Internet...etc
Is it CORRECT TO ADD "ing" to a verb ?
If I have MADE any mistakeS  ABOUT anythings PLEASE tell me, thank you.

Yes you can use "-ing"
so talking, calling, surfing, texting, ringing, skyping, messaging, pinging etc