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ERICSSON R380 RINGTONES

Ericsson R380 ringtones

Symbian OS is an operating system, designed for mobile devices, with associated libraries, user interface frameworks and reference implementations of common tools, produced by Symbian Ltd. It is a descendant of Psion's EPOC and runs exclusively on ARM processors.

Symbian is currently owned by Ericsson (15. 6%), Nokia (47. 9%), Panasonic (10. 5%), Samsung (4. Ringtones, Type, Monophonic. 5%), Siemens AG (8. 4%), and Sony Ericsson (13. 1%). Whilst BenQ has acquired the mobile phone subsidiary of Siemens AG the Siemens AG stake in Symbian does not automatically pass to BenQ - this will need the approval of the Symbian Supervisory Board.

[edit] Design

Symbian OS, with its roots in Psion Software's EPOC is structured like many desktop operating systems, with pre-emptive multitasking, multithreading, and memory protection.

Symbian OS's major advantage is the fact that it was built for handheld devices, with limited resources, that may be running for months or years. GSMArenacom: Ericsson T39 phone specs information this mobile, although it doesnt even have polyphonic ringtones or Ericsson T20e; Ericsson T20s; Ericsson A2628; Ericsson T36; Ericsson R380. There is a strong emphasis on conserving memory, using Symbian-specific programming idioms such as descriptors and a cleanup stack. Together with other techniques, these keep memory usage low and memory leaks rare. There are similar techniques for conserving disk space (though the disks on Symbian devices are usually flash memory). Furthermore, all Symbian OS programming is event-based, and the CPU is switched off when applications are not directly dealing with an event. This is achieved through a programming idiom called active objects. Correct use of these techniques helps ensure longer battery life. Listen to our Free Ringtones.

All of this makes Symbian OS's flavour of C++[citation needed] very specialised, with a gradual learning curve[citation needed].