Messaging is currently missing a number of features you might use in Windows Phone 8.1, including dual-SIM support, search, message drafts, sharing voice notes and ringtones, Bi-Di language support, international assisted dialing, spam filter, viewing all group recipients, reminders and quiet hours through Cortana, multiple attachments, and GSM support. If you use these features regularly, you’ll want to wait to install the preview until we get them into a future build.
Cortana is only available in English (United States) for phones. In other locales, you’ll get the standard search experience.
The Rooms feature is not available in the preview. You’ll still be able to get to your photo albums, calendars, and notes, either on the web or by using other apps on your phone. You won’t be able to see your chat history or send or receive any new chats. If you have important info in your Rooms chats that you want to keep, save a copy to a different device before updating your phone to Technical Preview. For more info, take a look at the Rooms FAQ.
Some text in the preview will not yet have been translated into all available languages and will only appear in English. This text will be translated into all available languages by the time the final product is available.
The Phone app doesn’t have Dual SIM support or spam filtering in the preview.
Accessibility features are still being developed for Windows 10, so they aren’t fully functional in Technical Preview. If you depend on features like Narrator while browsing the web, you may want to wait to update your phone.
Here are the big issues that we think you should know about for this build. In most cases a fix is coming in a future build, but a few have workarounds you can try in the meantime.
|Existing alarms will not be migrated to Windows 10||Reset alarms after upgrade|
|Wi-Fi settings don’t roam when phone is upgraded to Windows 10||Manually set Wi-Fi settings when on Windows 10|
|VPN not available in current Windows 10 builds. Setting will fail to launch. Coming in a future update||–|
|Additional language keyboards may not be present and may not be able to install on US builds after upgrading to Windows 10||Reopen the Windows Insider app and re-select Insider Fast/Slow again. The download of keyboard packages will then work|
|Photos app will fail to launch periodically when attempting to add a photo attachment to an email, OneNote or Facebook item.||Try again. Succeeds after a few attempts.|
|Quiet Hours is missing the automatic rule that enables Quiet hours during calendar appointments marked busy. Also the setting “Anyone breaks through if they call 2 times in 3 minutes” us unchecked but enabled.||–|
|Apps are not displayed in Battery saver after the upgrade.||–|
|Access Point Names (APNs) in recovery images can fall out of date. For some phones/networks, this will block the cellular data and MMS capabilities of a phone when recovering back to the base image.||Before using the Windows Mobile Recovery Tool to recover, record the specific APN settings on your phone. Set manually once phone restored|
|Cellular data not working while roaming, despite enabling data roaming||The setting doesn’t work the first time it’s enabled. Turning off and then turning on again will enable data while roaming|
|Using a Bluetooth headset while playing back video results in low frame rate for video, due to a bug in the interaction between video playback and Bluetooth.||Use wired headset for listening to audio when playing videos.|
|Sync to Microsoft Band doesn’t work after updating to Windows 10. If you have your phone synced to Microsoft band, it will not pair after the update to Windows 10.||After upgrade to Windows 10, go to Bluetooth settings, un-pair the Microsoft Band device and re-pair it.|
|DataSense resets data use history on upgrade to Windows 10.||No workaround. Will calculate correctly after the reset.|
|Trying to set lock screen picture will fail at times||Re-attempt the operation.|
|After upgrade, tapping on “Playlist” from start screen or from within Music App fails to play music. Playlists are greyed out.||–|
|Cortana tile and settings are missing on the start screen after upgrade||Go to app list and re-pin the tile|
Technical Preview is available in the following languages: English (United States), English (United Kingdom), Chinese (Simplified), Chinese (Traditional), Portuguese (Brazilian), Japanese, Russian, German, French, French (Canada), Korean, Italian, Spanish, Spanish (Latin America), Swedish, Finnish, Turkish, Arabic, Dutch, Czech, Polish, and Thai.
Note: Technical Preview expires on October 1, 2015