1. Windows Central Question's Avatar
    I have a att locked lumia 520 and i got it unlocked and was using tmobile sim on it. I upgraded software to windows 10 and since then i am unable to use tmobile with my lumia.

    I even tried entering the code manually by dialing ##7820# and then entering the code. It does show unlock symbol, but does not actually show any network.
    12-05-2016 04:09 PM
  2. xandros9's Avatar
    The Lumia 520 was never supposed to see the official upgrade to Windows 10 Mobile. If it was installed by way of the various spoofs/hacks available then you've entered dangerous territory. Does it work with any other SIM perhaps?
    12-05-2016 04:11 PM
  3. abhishek singh21's Avatar
    If you need additional help or want to reply to this thread , learn how to join windows central.
    12-06-2016 10:35 PM

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