Here are the known issues in the new Windows 10 for phones 10051 build

The new Windows 10 for phones 10051 build is being launched today, but not without some known issues. Microsoft provided a list of the problems users might experience when they download and install the build.

The list of issues include problem

• There might be situations in which auto-upload of your Camera Roll to OneDrive may not be working. Please be sure to back up your photos especially if you need to use the Windows Phone Recovery Tool to go back to Windows Phone 8.1.
• The Office Hub has been removed from this build. You won't be able to open Word, Excel, PowerPoint or OneNote files in this build. Preview versions of the Universal Office apps will be available in the coming weeks.
• We are redoing how text messages are handled and processed by Cortana so in this build text messages cannot be read out over Bluetooth.
• After upgrade, some apps that have been installed onto a SD memory card will fail to launch. To fix this, uninstall and reinstall the apps.
• About 1% of the time, incoming phone calls may not play a ringing sound.
• Call + SMS filtering will not work after upgrade.
• For people upgrading their phone from Build 9941, there is a bug in which your phone's MMS settings will be lost after upgrade. The new Messaging app doesn't yet have the ability to re-enter these settings. You will need to use the Windows Phone Recovery Tool to go back to Windows Phone 8.1 and then upgrade to this build to get MMS working again.
• Also for people upgrading their phone from Build 9941, the tiles on your Start screen for the Camera and Photos apps may be missing or corrupt. You will have to unpin any corrupt tiles and re-pin the apps to your Start screen.
• On some phones, due to a scaling bug the dismiss button won't be visible when an alarm is triggered. To stop your phone from "alarming "just touch the arrow and swipe up on the notification and off the screen to end the alarm.
• On phones with 512MB of memory, apps can randomly crash due to an issue with memory management.
• Flight mode cannot be enabled.
• Data connections can't be disabled.
• You may need to re-pin the Phone app after upgrade.
• The Insider Hub is now included on Phone but may fail to launch on some phones.

ms with apps crashing with phones that have just 512MB of RAM, no text messaging read out over Bluetooth and more. Here's the full list:

Microsoft says the Windows 10 team is working to fix all of these issues for future builds.

Windows Phone 8.1 Update 2 Rolling Out With New Settings UI and More: Report

Microsoft has reportedly started rolling out the Windows Phone 8.1 GDR2 update, or Windows Phone 8.1 Update 2, to certain handsets, and with it bringing a few new features to the platform.

As per user reports (via Windows Central) the new features deal largely with the smartphones' Settings interface. A full changelog has yet to be published.

The Windows Phone 8.1 GDR2 update divides the Settings UI into categories, and brings the option to pin individual settings on the home screen. It is worth noting that these features were previously available for the Windows Phone handsets but via third-party apps.

(Also see:Microsoft Lumia 640, Lumia 640 XL Launched Alongside Dual SIM, LTE Variants)

Windows Phone 8.1 Update 2 also brings the support for Bluetooth keyboard, which was unveiled during the MWC 2015 trade show by Microsoft. Furthermore, the Redmond-based tech firm appears to have slightly changed the app permission settings letting Windows Phone users disable access to certain function like camera or other privacy features, on per app basis.

Lastly, the Windows Phone 8.1 GDR2 update has introduced a new feature called "quick text", which is nothing but a set of pre-defined phrases users can bring up on the keyboard to send as a quick response. The full changelog for the Windows Phone 8.1 GDR2 update has not been mentioned as of now.

(Also see:Microsoft Lumia 640 and Lumia 640 XL First Impressions)

In February, Microsoft started rolling out the Lumia Denim update in India, which includes features like Cortana, Live folders, Apps Corner, SMS merge and forwarding, Snooze Times, Consumer VPN, and Internet Explorer improvements. The update also adds certain exclusive features to Lumia devices, such as bringing the Lumia Camera app to select devices (Lumia 930, Lumia Icon, Lumia 1520, Lumia 830), and other camera improvements, apart from the Glance screen, and Hey Cortana voice activation (only on Lumia 930 and Lumia Icon).

More details revealed about Windows 10 for phones preview of Project Spartan browser

"You'll find that this build has our new design for our Windows phone version, with the address bar on top, and a small actions bar at the bottom (a bug in this build means that the actions menu is larger than its intended to be). We've heard your early feedback about the position of the address bar, and we are looking closely at the design. We encourage you to try out, see what you think, and continue to share your feedback with us."

Windows phone 10 preview Supporting Devices

Devices supported with 10051 build

So, let’s start with the good news: a TON more devices are supported for this build, and we’re excited for Insiders with these devices to start using Windows 10 and sending us feedback.

• Lumia 1020
• Lumia 1320
• Lumia 1520
• Lumia 520
• Lumia 525
• Lumia 526
• Lumia 530
• Lumia 530 Dual Sim
• Lumia 535
• Lumia 620
• Lumia 625
• Lumia 630
• Lumia 630 Dual Sim
• Lumia 635
• Lumia 636
• Lumia 638
• Lumia 720
• Lumia 730
• Lumia 730 Dual SIM
• Lumia 735
• Lumia 810
• Lumia 820
• Lumia 822
• Lumia 830
• Lumia 920
• Lumia 925
• Lumia 928
• Microsoft Lumia 430
• Microsoft Lumia 435
• Microsoft Lumia 435 Dual SIM
• Microsoft Lumia 435 Dual SIM DTV
• Microsoft Lumia 532
• Microsoft Lumia 532 Dual SIM
• Microsoft Lumia 640 Dual SIM
• Microsoft Lumia 535 Dual SIM