Microsoft Edge (rebranded from Project Spartan)
- Address bar at bottom
- Include option to view website in desktop or mobile view
- IMPORTANT NOTE: Any favorites, cookies, history and Reading list items that you had saved in the Project Spartan app to be lost after upgrading from a previous Windows 10 Mobile Insider Preview build.

General UX improvements and refinement
- Fixed an issue where many Live tiles pinned to Start would appear blurry
- Updated icons and visuals (such as the volume controls).

Improvements to Cortana
- Can now set up Quiet hours in Cortana's Notebook

Flashlight quick action in Action Centre
- No longer need third party app

Updated Photo app
- GIF support (only for phone with 1GB of RAM or higher)

Automatic camera upload via OneDrive
- Now managed directly with the OneDrive app on your phone

Various first-party app update
- Outlook Mail
- Outlook Calendar
- Music
- Movies & TV
- News
- Weather
- Sports
- Money

- Call + SMS filtering would not work after upgrade.
- Text notifications weren’t appearing for incoming messages.
- Podcast app wouldn’t work.
- Apps were having trouble installing or updating via the Store Beta.
- Navigation bar couldn’t be hidden

Issue :
There is an issue where the Install button doesn’t respond after Build 10149 is downloaded

Workaround :
Make sure the battery is charged >40% and press it again.
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Issue :
Some people may encounter an 80091007 error trying to upgrade to this build from Build 10136.

Workaround :
Use the Windows Phone Recovery Tool to go back to Windows Phone 8.1 and then upgrade to Build 10149.
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Issue :
The Insider Hub is removed in this build.

Workaround :
None
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Issue :
Sometimes the PIN keypad won’t be shown after swiping up to unlock.

Workaround :
Swipe down to get to Action Center and try to open a notification or Settings to invoke the PIN keypad to unlock your phone.
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Issue :
There is a very rare situation where you are unable to unlock your phone after entering your PIN and it keeps letting you type even though you entered your pin correctly.

Workaround :
Leave the phone alone 1-2 hours before trying to unlock again. This is caused by a TPM issue that could get worse and require you to reflash if you get into this state and power off the phone.
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Issue :
If a Gmail account is set up on the phone, the Messaging app may have issues and both incoming and outgoing messages may not work.

Workaround :
simply reboot your phone to get it working again. We are aware that the Messaging app may behave badly in this state.
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Issue :
There is a known issue where apps or games are installed as trial versions even though you have previously purchased them. In-app purchases on Windows 10 Mobile are not functional yet as we migrate the function to the new Windows Store.

Workaround :
None
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Issue :
In certain cases, the colors in some apps may appear off. For example – the titlebar in the Outlook Mail app is orange.

Workaround :
None
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Issue :
There might be some cases where notifications in Action Center appear blank.

Workaround :
None