|O&M - Operations and Maintenance
|OLED - Organic Light-Emitting Diode. A next-generation display technology that consists of small dots of organic polymer that emit light when charged with electricity. OLED displays are thinner, lighter, brighter, cheaper to manufacture and consume less power than the current LCD displays.
|OMC - Operations and Maintenance Centre
|OMC-R - The radio OMC
|OMC-S - The switching OMC
|One-touch dialling - The ability to dial frequently called numbers using a single key stroke; see Speed Dialling
|OSI - Open Systems Interconnection; a seven layer model for protocols defined by ISO
|OTA - Over the air activation (of services and tariff changes)