What is AMPS (advanced mobile phone service)?

Advanced Mobile Phone Service (AMPS) is a framework for Analog signal cellular telephone service in many countries. AMPS was an analog mobile phone system standard initially created by Bell Labs. AMPS allocates frequency ranges within the 800 and 900 Megahertz (MHz) spectrum to cellular telephones. AMPS is a first-generation cellular technology that utilizes different frequencies, for each conversation.