Last we saw Windows 10 for Phones Build 10038.12518 leaking in screenshots and it revealed changes like Pinnable settings, Microsoft Yahei font, Changed Phone dialer UI and more. Now a slightly advanced Windows 10 for Phones Build 8.15.12521 screenshots have been posted. It also confirms pinnable settings and also some interesting changes like LED notifications, Resetting of the primary Microsoft account without returning to Factory settings, Import / Export to primary SIM and more.

LED notifications:

Windows 10.4Resetting primary Microsoft account:

Windows 10 accountExport / Import from SIM:

Windows 10.3Windows 10.2Microphone settings:Microphone

You can read all about the Windows 10 for Phones details at our dedicated page.

Thanks Polska for the tip. Cheers!!