Hello gang, I have a friend who works for UPS Freight as a part-time dock worker for a few weeks, and recently he was told by his supervisor to be on call for work, meaning he has to wait for a phone call before he'll be able to go to work if he's needed. Until then he's out of work. He wasn't given a time of when he'll be called, nor was he given a reason why he was chosen to be an on-call worker. It's been a few days now, and he has yet to get a single call. Should my friend be concerned and go to the HR in person to sort out this matter as soon as possible? Your input is greatly appreciated.