You know what they say, all good things come to an end. Symbian's adventures are over after having been in this world since the 90s. The Nokia 808 PureView is, officially, the last Symbian phone ever. The guys at Nokia have said during the company's transition to Windows Phone in 2012 yet continued to sell Symbian phones, but the 808 PureView, launched in mid-2012, has been chosen as the last bearer of that operating system.
Throughout its history Symbian underwent many changes, but began to decline with the introduction of the iPhone and smartphones with touch screens and does about 5 or 6 years ago.
There is no doubt that Nokia will now begin to focus all its production to smartphones that run Windows Phone.