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OTA

Over the air activation (of services and tariff changes)

O&M

Operations and Maintenance

OMC

Operations and Maintenance Centre

OMC-R

The radio OMC

OMC-S

The switching OMC

OSI

Open Systems Interconnection; a seven layer model for protocols defined by ISO

 

The Consumer Mobile Glossary

One-touch dialling

The ability to dial frequently called numbers using a single key stroke; see Speed Dialling