03-09-2019 05:00 PM
27 12
  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
27 12

Similar Threads

  1. Unlock code from T-Mobile?
    By tai4de2 in forum Nokia Lumia 810
    Replies: 58
    Last Post: 09-12-2017, 06:03 AM
  2. AT&T giving out unlock codes for HTC Titan
    By HeyCori in forum HTC TITAN
    Replies: 11
    Last Post: 01-10-2015, 09:18 AM
  3. Unlocked At&t TITAN
    By GekkoAce in forum HTC TITAN
    Replies: 9
    Last Post: 01-06-2013, 09:06 PM
  4. Unlock code from T-Mobile?
    By tai4de2 in forum HTC 8X
    Replies: 4
    Last Post: 11-21-2012, 11:34 PM
  5. Are Unlocked Titans free from at&t throttling?
    By Rocket_Girl in forum HTC TITAN
    Replies: 13
    Last Post: 12-08-2011, 05:36 PM