The anticipation is building for the next Preview build of Windows 10 on Phones. It's been a while since the first, very early build was released to Windows Insiders and one is expected soon. Some sources claim that a build should drop this week, but let's take a quick look on where Microsoft are in the process.

The partition stitching feature code has been added to the latest internal builds, which will allow the system to dynamically use some free space from other storage to temporarily have enough space to update.

​This feature and testing has allowed Microsoft to immediately add support for a wider variety of handsets.

While this will include many more phones, if any individual handsets cause issues during testing Microsoft are prepared to drop them from the supported list for the next build rather than delay the next build awaiting a fix. One notable casualty is the Lumia 930 / icon, which isn't included in the list.

Here is the current list of phones Microsoft expect to support with the next Tech Preview build:

• 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