03-09-2019 05:00 PM
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  1. Asvin Peiris's Avatar
    I'm having the same issue.
    I got the code from ATT. Tried entering it, says incorrect code (It is correct though). Then I try entering it again and it says SIM error. After that any number I put doesn't use up an attempt in order for me to finish all my attempts and try the PUK method.

    Any solution? Called ATT & Microsoft Mobile, both seem to have no idea. Unlock code is correct (triple checked with ATT)
    09-10-2015 06:10 PM
  2. mobilelawyer's Avatar
    Unlocking Lumia 900 -- AT&T SIM/Network Lock Code Is Incorrect - FIXED!

    The workaround is this: Enter the incorrect code until you run out of your ten (10) attempts. Then you'll get the *real* network unlock message, with 32 attempts. Enter the same 8-digit code you've been entering, and voila, you're now free to use this on any network!

    It worked for me
    Kudos to Breex243@xda-developers
    This just worked for my ATT Lumia 900. So glad I found this thread... in 2019!!!
    03-09-2019 05:00 PM
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