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Microsoft China confirms the existence of ‘Lumia Phone X / Lumia X / Surface Phone’ by mistake -- via a description on a video. Reuters

Users, who are registered with the Windows Insider program of Microsoft, are able to install the latest Windows 10 Mobile builds. However, other users are currently stuck on the older Windows Phone 8.1 OS on their devices. Fresh details now suggest that the release of Windows 10 Mobile OS is imminent.

According to Phone Arena, Microsoft had announced previously that it would be release the final version of Windows 10 Mobile OS by December last year. But that didn't happen. In December 2015, fresh information surfaced stating that the Windows 10 Mobile OS update will be available by early 2016.

Now, Vodafone Australia has announced on Twitter that it is currently waiting to test the Windows 10 Mobile OS by the middle of January. On the other hand, Movistar Spain, another cellular service provider, is expecting to release Windows 10 Mobile OS update to it users before the end of January, WM Power User reported.

Through the official Twitter account of Microsoft Lumia Support, it has been revealed that the Windows 10 Mobile OS update would be available soon. The information revealed by the aforementioned carriers as well as by Microsoft indicates that all the eligible devices running on Windows Phone 8.1 will be able to upgrade to Windows 10 Mobile either by the end of this month or in the next month.

According to the official Lumia Support page, in order to install the Windows 10 Mobile OS update on a Lumia smartphone, it should have at least 8 GB of internal storage capacity. One needs to be aware that even though low-end devices will be upgradable to Window 10 Mobile, they won’t be able to support all the Windows 10 features.

To upgrade to Windows 10 Mobile, users are required to also have Lumia Denim OS version 8.10.14219.341 or above installed. In order to check for the most recent software release, users can navigate to Settings > extras + info.