Find my iPhone? DO NOT WRITE MY QUESTIONS UNTIL YOU HAVE READ

Hello there,

I have a iphone with the latest version.

I created a sim pin for my phone.

1- Can i find the location after my phone is turned off?

2- Airplane mode is active and my phone is off. My sim card was also removed. Does my phone share its location with other phones?

3- How can i prevent a stolen phone from being put into dfu mode?

4- If it can't be blocked, should I disable the power button by opening the inside of the phone?