Share via

Activate windows by phone

Yoga Sehoga 0 Reputation points
2026-06-04T07:01:57.97+00:00

Good afternoon, I have windows phoduct key but not able activate windows by phone, the error is "Can't activate Windows by phone" Contact your system administrator for more info.

Windows for home | Windows 10 | Licensing and activation
0 comments

4 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Yoga Sehoga 0 Reputation points
    2026-06-04T07:52:49.45+00:00

    Plz Speak with me by telephone

    Was this answer helpful?

    0 comments
  2. Yoga Sehoga 0 Reputation points
    2026-06-04T07:50:05.58+00:00

    I have purchased new Windows key, it is not working, call me early as possibly.

    (PII Removed).

    Was this answer helpful?

  3. DaveM121 888K Reputation points Independent Advisor
    2026-06-04T07:36:13.45+00:00

    1

    Microsoft have deprecated the phone activation service, that is no longer an option, is your PC an offline PC and not connected to the Internet?

    2

    What happened on your PC before it was no longer activated?

    3

    Where did you get your Windows licence was that pre-installed on the PC or did you purchase a full retail Windows licence from Microsoft or from a 3rd party retailer?

    Or is your Windows licence based on a previous Windows 7 or 8 licence?

    Was this answer helpful?

    0 comments

  4. AI answer

    2026-06-04T07:02:22.6266667+00:00

    Windows 10 normally must be activated online. Phone activation is only available in specific cases and is not supported for some editions.

    Since phone activation is failing with “Can't activate Windows by phone,” use these steps instead:

    1. Connect to the internet and try online activation
      1. Select Start > Settings > Update & Security > Activation.
      2. If you see an option to Change product key, select it, enter the Windows 10 product key, and follow the prompts.
      3. Stay connected to the internet while Windows attempts activation.
    2. If online activation fails, run the activation troubleshooter
      1. In Settings > Update & Security > Activation, check for a Troubleshoot link.
      2. Run the troubleshooter and follow the on‑screen guidance to resolve common activation errors.
    3. If the key has already been used or is blocked
      • If you see errors such as 0xC004C008, 0xC004C770, or 0x803FA071, the key may already be used on another device or more devices than allowed. In that case, a separate product key is required for this device.
    4. If activation still does not work
      • Check the specific error code shown on the Activation page and then follow the guidance in Get help with Windows activation errors.
      • If the error code is not listed there, contact Microsoft customer support from that article.

    If the device is running an edition such as Windows 10 Pro EDU or Windows 10 Pro for Workstations, note that these editions must be activated over the internet; phone activation (including SLUI 04) cannot be used.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

    Was this answer helpful?

Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.