In America, some carriers disable hotspot on the devices they sell and hold you hostage. There are many ways around this. The best way is to use OEM non carrier phones. Other options include pdanet and several other apps designed to bypass the carrier software locks. My graphene os hotspot works perfectly no matter what carrier I use
Edit: Oh, and you can forget it on iphones. Apple loves sucking carriers dicks and fucking you all over. They go out of their way to ensure the carriers are robbing you before allowing hotspot use
I have never hit anything when backing in or driving out forward. I have hit 4 vehicles while backing out. It may be an attention thing, no idea. It is better for my wallet to back in