GSM 900/1800 MHz meaning

A descriptive term used in telecoms and technology transactions to denote the 900 MHz and 1800 MHz radio spectrum bands historically used for 2G (GSM) mobile services. It is not a defined statutory term; it reflects industry usage and 3GPP GSM standards. In legal practice, “GSM 900/1800 MHz” commonly appears in spectrum licences and assignments, spectrum trading and auction documents, network sharing and roaming agreements, MVNO arrangements, equipment procurement, and site access or mast agreements. The bands are licensed and regulated by Ofcom in the UK and ComReg in Ireland. While originally tied to GSM, many current licences are technology‑neutral, permitting use for later generations (for example LTE/4G) subject to technical conditions, interference management and coordination requirements. Key considerations include coverage and quality‑of‑service obligations, EMF and health compliance, cross‑border coordination, lawful interception and emergency services access, and restrictions on power, bandwidth and out‑of‑band emissions. References to “GSM 900/1800 MHz” should be read against the specific licence terms, band plans and regulatory decisions in the relevant jurisdiction. Usage and technical characteristics are broadly harmonised across England & Wales, Scotland, Northern Ireland and Ireland, though licensing procedures, fees and obligations are administered separately by Ofcom and ComReg.