Windows Phone 4 Apollo unveiled at Microsoft 's 2015 summit . 3-D navigation did n't make it . Newly announced features for operating system included a new start button . Phone will run on powerful dual - core processors . It will also include a new chat feature for users .
Windows Phone 4 Apollo unveiled at Microsoft 's 2015 summit . Newly announced features for operating system included a new start button . Phone will run on powerful dual - core processors . It will also include a new chat feature for users .