A pager (sometimes called a beeper or bleep) is a simple personal telecommunications device for short messages. A one-way numeric pager can only receive a message consisting of a few digits, typically a phone number that the user is then expected to call. Alphanumeric pagers are available, as well as two-way pagers that have the ability to send and receive email, numeric pages, and SMS messages. Until the popular adoption of mobile phones in the 1990s, pagers fulfilled the role of common personal and mobile communications. Today, pagers mainly support the "critical messaging" markets. They are the ideal solution for very quick, very reliable personal or group messaging. Unlike many other mobile communications networks, they continue to work in times of emergency or disaster as they do not suffer from network overload as has been proven many times (September 11 attacks, Hurricane Katrina). For this reason, they are still very popular with emergency service personnel, medical personnel, and information technology support staff. Paging is a subscription service offered in a variety of plans and options to meet the needs of a subscriber and the type of device used. In general, all pagers are given unique phone numbers while alphanumeric pagers are given an email address, usually consisting of the phone number.

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