It's not merely a big surprise that Microsoft's considering several major additional features in Windows 10 Redstone 5, due at the fall, but a silent update in the latest Skip Ahead build made plenty of people think that there's another for phone capabilities inside of the OS far too.

Windows 10 build 17650, and that is currently available limited insiders signed up for the Skip Ahead ring as part of the Windows Insider program, delivers the phone-related APIs, originally removed in 2017.

While pulling them from Windows 10 was more like a confirmation that Microsoft don't planned anything new on the telephone front approach this systematically, re-including the API around the operating system features the opposite effect it is seen by a few as an indication that Redmond isn't over and done with mobile capabilities.
"No new Microsoft phone though"

But as you move the phone API has returned in Windows 10, it doesn't necessarily indicate that Microsoft is working with a new smartphone powered by the OS.

Instead, there's a more substantial chance they is actually exploring phone capabilities for that other devices, including here the Always-Connected PCs running on Windows 10 on ARM. Strategies are powered by Snapdragon mobile chips, which technically already support phone capabilities, so Microsoft could be looking into the way to expand space of its Always Connected PCs with Redstone 5.

Also, this silent update is definitely a sign which a Andromeda project advances and may even come to fruition as the next major Windows 10 feature release is in a position in the fall.

Andromeda, contains often been known as a new cell phone from Microsoft, won't turned into a phone per se, but a multi-form factor device that may possibly play the role of a laptop, a tablet, and perchance of a smartphone. These capabilities bundled into Windows 10 could power the smartphone form factor, though as just stated, this is just unrealistic for the time being and zilch more.