I have personally experienced this. We had to put work apps on our phones, and one day my information would not transmit. I messaged a boss and he said “try cutting off the wifi”. I said “okay, but I’m not on their wifi”

Long story short, yes I had been slammed into the location’s wifi that I was visiting. Then it multiplied into three different apps we had to have, sending tons of information back and forth, (I had never signed in to anyone else’s WiFi)

I ended up buying a cheap Motorola WiFi phone to do my work on, and make sure my WiFi on my personal phone is cut off everywhere but home.

Insanity. That’s a security flaw for our own government