In recent events, I learned that some pagers only have receivers. How are discrete messages sent to these devices? How is it authenticated? How do they know the device got the message?
In recent events, I learned that some pagers only have receivers. How are discrete messages sent to these devices? How is it authenticated? How do they know the device got the message?
Pagers operate at a lower broadcast frequency than cell phones. Longer wavelengths (low frequency) are less impeded by walls and interference.