Dona Sarkar has announced that Microsoft has released Windows 10 Mobile Insider Preview Build 15252 to Insiders in the Fast ring
General changes, improvements, and fixes for MobileWindows 10 Insider Preview Build 15252 for Mobile
This build includes all the improvements from KB4038788.
In preparation for the release of the Windows 10 Fall Creators Update, the product version number has been updated to 1709 just like PC.
We fixed an issue where, on powering the screen off/on, high demand for CPU could cause several apps to crash. Background processing of photos is an example of high CPU demand. In a photo shoot session, you may have seen the Camera app crash.
We fixed an issue with the Messaging app where conversation text was displayed incorrectly. Thanks to our Insiders that quickly highlighted this issue.