1G, or first-generation wireless technology, refers to the initial analog mobile communication systems introduced in the late 1970s and early 1980s. It primarily enabled voice calls and was characterized by low-quality audio and limited capacity. The most notable 1G system was the AMPS (Advanced Mobile Phone System), which allowed users to make calls over a cellular network. 1G networks operated on large, bulky mobile phones that required significant power and had limited battery life. As technology advanced, 1G was eventually replaced by digital systems, leading to the development of 2G and subsequent generations, which offered improved voice quality and data services.