I tweeted that the Nokia 600 cant be found anywhere in Nokia specs page and Nokia developer site so it may have been discontinued. Later official twitter account from @Nokia replied to a person saying that they no plans to bring it to markets.
Nokia 600 was called the Loudest of Nokia Smartphones with 106phon speaker and FM Transmitter . Unfortunately Nokia cancelled its production. But hey we got the cool 603! nothing to worry about 😉 Nokia maybe using the hardware for Windows Phone devices .