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It is not illegal for employers to insist that you keep a phone that tracks you while you are on duty. If you make runs outside your truck as part of your job, the employer can request that the phone be taken with you.
However, the rules are different when one is off duty. While an employer cannot TRACK a person, an employer CAN demand that a phone be kept near the person in case of emergencies. (Doctors have this often, for example.) However, it would be unlawful for the employer to track the person while off duty using that phone.
Finally, if one signed a contract that specifically allows the employer to track you via phone and agree to carry the phone, then that contract DOES give the employer that right.
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