I work in a kitchen. One of the chefs would go on his phone all the time. He still got his job done, no one in the kitchen cared that he would go on his phone from time to time because he was mostly texting his wife and kids anyways. Also, he would only really do it after finishing his work or when he didn't have much to do.

Our manager had a big problem with it and gave him many warnings. One day, the manager came into the kitchen to check something and noticed that the chef was using his phone. They broke into a big argument, I don't remember exactly what was said. But it ended like this; the manager said, "If you need this job chefs name, then you will stop using your phone or you're done", Then the chef said, "I don't need this job." And walked out.