Companies can restrict most cell phone or smartphone access and/or usage. This restriction can only be during work times so employees will usually need to be able to access and use their phones during breaks.
If employees do not need their phones for work purposes, you can establish a clear policy that they must be kept out of sight except when used during an approved break period. If there is an emergency situation, then allow them to have it on a limited basis with approval.
If employees use their phones for work, you can limit the usage to business purposes and prohibit distractions during work time. This can also apply to remote employees.
Whatever restrictions you want to impose, be sure to have a clear written policy and apply it consistently to all employees.
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