| API | Application Programming Interface |
| ECom | Epoc Component object model. Symbian OS framework for plug-in DLLs |
| MTM | Message Type Module. A group of components that together provide message handling for a particular protocol |
| MMS | Multimedia Messaging Service Protocol defined by 3GPP. Messaging for text, images, audio |
| SMS | Short Message Service. A GSM digital mobile phone standard which enables a single short text message up to 160 characters long to be sent to a mobile phone |
| IR | Infrared |