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(Pocket-lint) - Windows 10 for Mobile is coming - and Microsoft is beginning to get customers ready for its release.

The company has already listed some devices that are eligible for Windows 10 for Mobile, but now it's adding more devices to that list. The Microsoft Store is starting to recommend devices that support Windows 10.

Both the US and UK stores are showing "Windows 10 Ready" devices, and while the absence of flagship devices like the HTC One M8 is worrying, it's cool to see that the small list of support devices is growing.

When will Windows 10 for Mobile release?

Microsoft has already released Windows 10 for computers. We're now waiting on an edition for mobile devices.

The company said in the past that its new mobile OS would roll out sometime this autumn, but there's no confirmed release date as of yet. Microsoft has since scheduled a press event for 6 October, when it will likely unveil the latest Lumia flagships running Windows 10 for Mobile, so we might learn more then.

Which Windows Phone devices are eligible to upgrade?

Earlier this year, Microsoft said Windows 10 for Mobile would begin to roll out for free to handsets "when available". It also confirmed the first smartphones to get Windows 10 for Mobile will be:

  • Lumia 430, Lumia 435, Lumia 532, Lumia 535, Lumia 540, Lumia 640, Lumia 640 XL, Lumia 735, Lumia 830, and Lumia 930

More recently, Microsoft clarified via both its US and UK websites which Windows Phone handsets are currently "Windows 10 Ready", meaning they are eligible to upgrade. These are the devices on the UK site:

  • Lumia 635, Lumia 735, Lumia 830, Nokia Lumia 735, Lumia 830, Microsoft Lumia 535, Microsoft Lumia 435, Microsoft Lumia 640, Microsoft lumia 640 XL LTE, and Nokia Lumia 635

And these are the devices on the US site:

  • Microsoft Lumia 640 XL (AT&T), Microsoft Lumia 640 (AT&T - Black - No Contract), Microsoft Lumia 735 (Verizon), Lumia 635 (Black - Unlocked), and Lumia 635 (Sprint)

Note: Some phones listed on the UK site aren’t listed on the US site.

Want to know more?

Pocket-lint's Microsoft and Windows 10 hubs have all the latest news, reviews, and analysis.

Writing by Elyse Betters. Originally published on 15 September 2015.