Pagers were an early mobile platform that saw widespread adoption between 1975-1995, with 66 million users by 1995. However, pagers were later eclipsed by mobile phones, which grew to an install base of over 4.6 billion users by 2010, surpassing the popularity of pagers. Pagers were one of the first truly mobile platforms but were replaced by more advanced mobile phone technology in the late 20th century.