Can having a cell phone and using it for work be a required and unreimbursed condition of employment?

Question Details: My daughter was hired as an hourly regular employee of a small, regional, retail store. She was recently promoted to assistant manager, and was given paperwork detailing key procedures and such. She is still hourly, and her rate was increased by a few cents. Her manager told her that she is required to have her cell phone ON and on her person whenever she is on shift. This wouldn't be a big deal, but she has a prepaid phone. She has asked about getting reimbursed, but was told they don't do that. Is this legal? If she complains to the DOL, can they fire her?

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