Here are the fixes, improvements, and known issues in Windows 10 Mobile build 15055

Microsoft today released Windows 10 Mobile build 15055 to the Fast ring, making it the second one of its kind this week. Like its predecessor, which was 15051, there are no new front-facing features.

Indeed, we're getting closer to the Creators Update, which is going to be available to the public in April. But Microsoft has also said that it will come to PCs first, with other platforms - such as Windows 10 Mobile - following later. This really shouldn't affect Insiders though, as all versions of Windows 10 are developed in parallel, so the RTM build should be made available around the same time.

There may be no new features, but there are a few fixes, improvements, and known issues. There are surprisingly few, and far less than the corresponding PC build. Here's what's fixed and improved in Mobile build 15055:

  • We fixed an issue from recent flights where the volume control might stop working when listening to music in Groove after an endpoint change (for example plugging in headphones).

  • We’ve improved speech reliability by fixing a bug where Cortana was unexpectedly failing with a connection error.

  • We fixed an issue where multi-turn Cortana speech interactions weren’t working (for example, when creating a reminder in multiple parts, as opposed to doing it in a single sentence).

Here are the known issues:

  • We have discovered a bug that causes background tasks to not run in the background like they should such as OneDrive’s camera roll sync feature. Please double check your photos have synced to OneDrive on the latest builds. We’ve got a fix for this issue coming in an upcoming build where background tasks will run again and your camera roll will sync to OneDrive as expected.

  • If your device experiences an unexpected reboot, in some cases you may lose your call, text, and email history may be lost. We’re actively investigating this issue. If you believe you’ve hit this, please up-vote this feedback item In Feedback Hub.

  • There is a bug in this build that can cause a number of inbox apps to fail to launch (such as Store). There is no workaround to reset the Store unfortunately. This issue also prevents you from taking any app updates from the Store if the Store works for you. A workaround for this is to uninstall the app and reinstall the app from the Store. This issue will be fixed in the next build.

  • Speech packs may be unable to download on this build.

  • Some users are reporting that pages are constantly reloading or refreshing, especially while they are in the middle of scrolling them in Microsoft Edge. We’re investigating.

As you can see, these are significant known issues, and they're similar to those of 15051. Background tasks not working might be a deal-breaker for you, so it's important to be aware of that going into it. The inability to download speech packs has a pretty easy workaround, which is to make sure that you have them before you upgrade to this build; however, this has been an issue for some time.

If you're on the Fast ring, you can grab today's build by going to Settings -> Update & security -> Phone update -> Check for updates. If not, head over to the Windows Insider Program tab, tap 'Get started', and when your phone reboots, go back and set it to the Fast ring.

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