1. elvirr's Avatar
    ATT Microsoft Lumia 640 GoPhone.
    Orderer and received unlock code, but as I enter the unlocking code the phone asks for phone PUK unlock code, which I don't have and ATT support doesn't know what am I talking about. When i try to enter wrong unlock code, the counter goes to 4 and it starts from 10 again.
    When I enter ##7820# the phone shows like it's unlocked but it won't accept the sim card.


    06-22-2016 01:25 PM
  2. v535's Avatar
    It appears you need to contact ATT and get PUK code.
    06-22-2016 02:07 PM
  3. Lee Power's Avatar
    Asking for a PUK code means the sim card is locked by to many wrong SIM PIN attempts. Contact you service provider for your PUK code to unlock the SIM card.
    RumoredNow likes this.
    06-22-2016 02:48 PM
  4. elvirr's Avatar
    Nso matter shich sim card I use the phone asks for PUK code, so it's not the card.
    06-22-2016 03:50 PM
  5. westnz's Avatar
    I have same error, any luck yet? I read somewhere in a forum about entering a wrong unlock code 10 times to get to a real unlock screen then enter puk code there? have you tried that?
    06-23-2016 10:03 PM
  6. tummus's Avatar
    Same here. I have a Lumia 735.

    The problem is that it keeps 9 attemps left, no matter what. So that's not an option for me.

    The unlock code is correct because I dialed ##7820# and unlocked the lock image by entering it. However, the phone still requires the unlock code when I use another carrier SIM. (Works fine with original operator SIM, but is not mine)
    06-29-2016 08:26 AM
  7. westnz's Avatar
    I couldn't get a result from Microsoft either only a send in which isn't worth it as I'm in New Zealand and I would have to send it by my own cost back to USA.
    07-01-2016 04:01 AM

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