A two-way pager is a pager that allows you to send data as well as receive it. Some two-way pagers can handle alphanumeric input and display and can send and receive email and SMS messages.
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Pagers were once fairly widely used by people who frequently needed to be reachable when out of the home or office. Mobile phones have largely replaced them for general use. However, pagers are still fairly widely used among medical and emergency personnel as well as IT support staff.
Pager manufacturers include Motorola and Sharp.
Trivia tidbit: the BlackBerry began life as a two-way pager.