They run Symbian OS v9.2 and S60. This allows some level of customizability, though it can be slower than other, home-built OS's. One of the phone's biggest features was the inclusion of WiFi and SIP VoIP. Many users purchased it primarily for this function, making the cell providers their secondary carrier. The software suite predictably supports POP3 and IMAP, as well as BlackBerry Connect and Microsoft Exchange.
