Nokia OS [NOS / ISA]

Nokia OS (NOS) is an informal name for the operating system in many Nokia mobile phones. These are informal names, there is no such product or trademark. Officially it is referred as ISA platform. It is a proprietary platform only for Nokia's internal use, it is not licensed to anyone. No direct API is provided either, but most ISA phones can be programmed with J2ME. It is sometimes called the "domestic OS"..

ISA powers Nokia Series 40 and Series 30 mobile phones.