Default need only 3 apps

I have galaxy s4 android 4.3
I searched all of the google but find nothing
Pleasssssssssssssssssssse someone answer me
1 - is there any application for android to send flash sms(class 0) , that work on my device?
2 - is there any way or app that when we connect the phone to pc , we can see the sd card and all the files but can not copy all of them into pc or from pc to phone
3 - i need aan app or way that when we lock or hone screen , so by holding down the power button , we could not turn of the phone
thanks
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