A pager is a wireless communication device that receives and displays alphanumeric or voice messages. It is a small electronic device that is used to receive short messages or notifications without the need for an internet connection.
Before mobile phones became widely available, they were commonly used as a primary communication tool in the 1990s and early 2000s.


There are two types of pager :
- One-way: You can only receive messages.
- Two-way: You can acknowledge messages using a local messenger and reply to them.

The pager works simply, users enter a code into the device, which is transmitted to a receiving center or system that sends an alert to the pager. The pager can display short messages or short notifications, and in some models, users can reply to messages or call a specific number.

Although the use of pager has decreased significantly with the advent of smartphones، they are still used in certain areas، such as hospitals and healthcare facilities، that are used for quick and reliable alerts.

what happened in Beirut on Sept.17, was that the pagers server has been down by Israel، which led to the installation of a script that caused the overload. This is likely to cause the lithium battery to overheat, which later exploded. The physical damage to the device user can vary from severe to minor, depending on the location of the exposure to the device.

There are some ways to enhance the security of Pager to avoid pager explosion :
- These old devices often have security lack of features so make them more vulnerable to interception.
- Regularly update the pager software to make sure that the latest security patch have been added.
- Be aware of who you buy pager from.