New Windows 10 for Phones build has been leaked in screenshots. The most interesting part about this build is that Spartan browser is on-board. You can also notice some changes in the multitasking view with app name and icon on top now. You can now choose the app to be used for blocking and filtering calls and messages.
Spartan screenshots:
Spartan comes with “SmartScreen Filter” for protecting you from malicious sites. Spartan screenshots have leaked from other sources too. Check many more Spartan screenshots by clicking here.
Option to choose Spam filter app: 
