1, production line work: Workers on the production line usually don't need to use mobile phones, because their focus is on completing tasks on the production line, not using mobile phones.

2. Construction workers: Construction workers usually need to concentrate on their work, such as building houses, roads or bridges. They need to stay focused and avoid distractions, so they are not allowed to use mobile phones.

3. Laboratory work: Laboratory staff usually need to concentrate on their experiments and avoid interference. Therefore, they are not allowed to use mobile phones.

4. Writing or editing: Writers or editors need to concentrate on writing or editing tasks, so they are not allowed to use mobile phones. In order to finish the work on time, they need to stay focused.

5. Chef or baker: Chefs or bakers usually need to concentrate on their cooking work, so they are not allowed to use mobile phones. They need to stay focused in order to prepare high-quality dishes or baked goods.