Windows 10 Mobile Insider Preview Build 10136 released to Fast Ring

Microsoft has released a new Windows 10 Mobile Insider preview build 10136 on Fast ring today. Users who are upgrading to this build should note few very important things announced by Microsoft.

  • This is being offered to Windows Phone Insiders on Fast Ring and phones running Windows Phone 8.1
  • Those running previous build 10080 offered on Fast Ring will have to go back to Windows Phone 8.1 using the Windows Phone Recovery Tool if they want to upgrade to 10136. This is required because of a migration bug which is affecting upgrades from 10080 to this build. Once you are on Windows 8.1, one has to go to Windows Insider app and have to select Insider Fast again.
  • One will be able to upgrade directly to the latest 10136 in a single hop regardless of which Windows Phone 8.1 build you are on.
  • For those who are on Build 10080 and don’t want to go back to Windows 8.1 to upgrade to 10136 build, don’t have to do anything. As such users won’t be offered this upgrade but their phones will be configured for the next build as the migration issue will be fixed by that time.
  • And this is SUPER IMPORTANT as Microsoft put it, so don’t miss this for those who are upgrading to this build :

At the end of the upgrade the Lock screen will appear frozen without the date and time for up to 10 minutes. Please be patient and let it sit – eventually the date and time will appear and it will allow you to unlock your phone. There is a post-upgrade migration status screen missing, which normally would show you that it was making progress. If you get impatient and restart or mess with locking/unlocking your phone, you’ll wind up in a funky state – so just relax and let it do its thing.


Also ensure to read all the known issues before upgrading.

What’s new in build 10136

  • Lots of subtle changes to UX: There are far too many subtle changes in the UX to cover them all. Some noticeable ones are,
    • PIN pad now is transparent and slides up over lock screen image instead of displacing it.
    • changes to fonts, icons, layouts
    • more complete UX with refinements compared to 10080
  • Improved Cortana: The improvements in this build takes Cortana very close to final design.
    • adjustments to cards in Cortana’s homepage, hamburger menu
    • dark theme added
    • flight, packages tracking enabled. SOme other alerts too re-enabled.
    • inline answers to queries like weather, currency, stocks
  • Photos and Camera improvements:
    • tap on a month to get list of months making it easy to jump to photos taken long time back
    • double tap to zoom on photos
    • Performance and reliability updates
    • Users of Lumia 640, 640XL, 930, Icon, 1520 can check out Lumia Camera Beta, has additional features that light up based on hardware.
  • One-handed use made easier: Devices with screen size 5” or higher are now easier to use with one hand.
    • Press and hold Start button and the screen slides down making it easy to access items at top of the screen
    • tap the black space at top of screen or press and hold Start button again to slide the screen back
    • One-handed use will also time out after several sec.

Issues fixed from Build 10080:

  • MMS bug fixed
  • non responsive touch on lock screen preventing to unlock issue fixed
  • visual glitches in Action Center fixed
  • People app text too small issue fixed
  • toggling Wi-Fi quick action in Action Center now disables/enables Wi-Fi
  • Scaling of Start Screen background corrected
  • Detailed status to display on Lock screen can be added now from apps like Outlook Calendar without app crashing
  • mouse cursor appearing when back button pressed issue fixed

Known issues in build 10136:

  • Duplicate tiles for apps like Search and Phone under All Apps after upgrading
  • Too many PIN unlock attempts will give “enter A1B2C3” reset experience. But in this build, after you enter the code, PIN pad won’t be seen. As a workaround, press Emergency Call after entering the code, then press Back and then will be able to enter PIN
    • It is recommended to disable double-tap-wake feature on some Lumia , Settings > Extras > Touch > Wake to prevent accidental PIN lock attempts
  • After upgrade Skype may not work. Workaround is to uninstall Skype before you upgrade to this build and then reinstall after upgrading. if you miss this , one can uninstall and reinstall on 10136
  • might have issue s installing new Language packs.

Announcing this new build, Microsoft’s Gabe Aul also said Microsoft need more time to deliver optimal experience for mobile devices and can expect Windows 10 Mobile to release broadly later this year.

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Vasudev G. is a Technology Enthusiast. He is a Windows Insider MVP and is committed to Microsoft technologies and products.


  1. Anand Venkateswaran


  2. Anand Venkateswaran

    I have a Nokia Lumia 630 windows phones…wanting to upgrade to 640XL…the concern that is holing me back is I am not able to attach douments(Word,Excel,PPT) in a trailing mail, though I can do so in a fresh mail….pls advise is this gonna be a never ending issue or is there a solution to fix…if no I will be forced to switch over to a Android Phone.

  3. vasudevG

    In Windows 10, totally new much improved Mail app is coming. If you are testing Windows 10, can try the new Mail app.

    I fully agree about the old mail app, there’s no direct option to attach docs in fresh mail. Have to open Office , from there you have to attach.

  4. Anand Venkateswaran

    Sir thank you for your reply….which is much appreciated….in short will I overcome this issue in the 640xl or will this continue?

  5. vasudevG

    Actually if you are interested, you can try the Windows 10 now on your Lumia 630 itself. (Please note at present its the preview so better to have it on backup Phone & not on your Primary phone ). When Windows 10 final ver gets released later this year..Windows Phones will get upgraded to Windows 10. So if you are not trying Preview on 630 now…later this year your 630 too will be upgraded. 640 XL too at present is running Windows 8.1 update 2 .

  6. Richard Campbell

    Will the nokia lumia 1020 be updated to windows 10

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