If your US Cellular Samsung phone isn't ringing when calls come in, it's probably set to silent mode. Silent mode is useful when you are in a situation where your phone's ringer would be a distraction or inconvenience. Watching a movie or attending a work meeting are two situations that you might need silent mode for. However, if you leave your phone in silent mode after that, you won't know when you receive a call unless you are looking at the Samsung phone. At this point, turn the ringer back on.
Click "Settings" on your Samsung phone's home screen.
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Click "Sounds and Display" in the Settings menu.
Click "Silent mode" to disable the silent setting on your Samsung phone.