Not all, but a lot of them are, especially ones in remote areas.
On many North American college and university campuses today, callboxes are installed at various locations around campus so that students, staff, or visitors can contact campus security in case of an emergency. Often, these are voice call boxes using a mobile phone service, and solar-powered so no wiring need be extended to the middle of a parking lot or other remote location. Thus, they can function during a power outage if the cell site is still powered.
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