Nokia Series 40
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Nokia Series 40 is a platform for mobile phones based on the same core (Nokia OS). It is found in more than 100 million devices[citation needed]. Series 40 devices all contain ARM processor cores driving a variety of RF technologies, such as GSM, UMTS and CDMA.
Series 40 on the surface appears to be a simpler operating system than the higher end Series 60, 80 and 90 (all based on Symbian's OSes) products Nokia produce. In depth though, the devices are just as complex with the sole exclusion of not allowing user installable applications other than Java MIDlets, Series 40 is just as capable platform as Series 60.
In the past Series 40 devices have been restricted to smaller displays such as 128x128 pixels. There are devices now that support QVGA (320x240) and exceed the resolution of most of the products running Series 60.
[edit] Software
Standard applications include a XHTML browser and an e-mail client with POP3 and IMAP capabilities. The XHTML browser can access most web content through the service providers XHTML/HTML gateway.
A major limitation in the phone software is that the e-mail client is not integrated with other applications; selecting an e-mail address from the phonebook or clicking on a e-mail link on a web page will not open the e-mail client. Instead a series of other communication methods is offered to contact the address, including SMS text message, MMS messages, all of which are charged a message based fee by the service provider. Some models even have two e-mail application; the real IP/GPRS based e-mail client, and a "e-mail" look-alike, that tries to send e-mail as text messages through the service provider's SMS/SMTP gateway. Another limitation is that the e-mail client cannot access the phone's filesystem. Photographs taken with the phone's inbuilt digital camera can thus only be sent as MMS messages.
