Other than a puppy chewing up my last flip phone I’ve never had a problem. Some people are forever breaking their phones and it might make sense for them. Me, I don’t do it.
I had a Motorola flip phone that fell out of my pocket while I was working on a truck. He took off and there was my phone ground into the gravel having just been run over by a load of logs. Funny thing was it still could make and receive calls. Screen was shot and battery drained extremely quick but could still communicate.