The North American version of Global System for Mobile Communications (GSM). GSM 1900 — a modification of the European specification, which operates at 900 megahertz (MHz) — enables GSM to be used in the 1,900-MHz frequency band, which the U.S. Federal Communications Commission and Industry Canada have allocated for personal communications services (PCS). See GSM and PCS.

Digital GSM standard at 1900 ÌHz frequency, also known as PCS, used in the USA, Canada, some countries of Latin America, Africa and Asia.

Or PCS 1900 uses the 1900 MHz frequency mainly in North America. INFRARED Infrared refers to energy in the region of the electromagnetic radiation spectrum at wavelengths longer than those of visible light, but shorter than those of radio waves. Infrared is used in a variety of wireless communications, monitoring, and control applications. MOBILE PHONE The term that can be inter-changed with cellular phone or wireless phone. PERSONAL IDENTIFICATION NUMBER, or PIN Used together with SIM card technology to place calls using prepaid cell phones.