Microsoft has released a new test build of Windows 10 Mobile, but has yet to specify a release date for this version of the platform that targets phones and small tablets with screens of 8in or smaller.
Windows 10 Mobile Insider Preview Build 10136 was made available overnight for testers on the Windows Insider programme who have opted to receive updates via the Fast ring.
It offers numerous fixes and refinements such as improvements to Cortana and the user interface, including changes that make a Windows Phone with a larger screen easier to use one-handed.
Microsoft pushed out Windows 10 Build 10130 for PCs to testers on the slow ring earlier this week, as the date of 29 July scheduled for the release code of this version draws closer.
However, Microsoft has yet to specify when the Windows 10 Mobile version for phones will hit final release. Writing on the Windows blog, Gabe Aul, Microsoft's director of programme management for the Windows Fundamentals team, said only that it will come later this year.
"While we're making good progress, we need more time to deliver the optimal experience for mobile devices and you can expect Windows 10 Mobile to release broadly later this year. We're incorporating lots of the great feedback from Insiders, so keep it coming!" he said.
The new build includes "tons of fit and finish changes", according to Aul, including user interface tweaks such as the PIN pad now being transparent and sliding up over the lock screen image instead of displacing it.
Other improvements have been made to Cortana, which is now "very close to our final design", Aul said, while the Photo and Camera apps have been updated.
Microsoft has also added a feature to make larger sized phones easier to use one-handed, in a move that will be seen as copying features of Apple's iPhone. Users can press and hold the Start button and the screen will temporarily slide down so that items at the top can be reached more easily.
Aul also warned testers that the latest Build 10136 can be installed only on handsets running Windows Phone 8.1.
Any testers running an earlier preview release of Windows 10 Mobile will thus have to use the Windows Phone Recovery Tool to revert to Windows Phone 8.1 before they can install the new version.
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