Iphone 11, will not connect to data or wifi and every time I open camera, the phone restarts.

My iphone was dropped by another person, the buttons stopped working shortly, but are now starting to work, but I cannot get access to cellular data or wifi. I have reset the networks repeatedly. I have taken my sim card in and out. I have turned my phone on and off multiple times. I tried the exact sim card in an old iPhone and it worked no problem, but will not work with my iPhone 11. I tried connecting it to my computer to do an update through the computer, but it will not allow me. Every time I go to open the camera, it will automatically restart my phone. The flashlight will not work either. Please help.