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  1. jefbeard911's Avatar

    Before I moved overseas I got the Unlock code from ATT and tried it with my new sim. I was told by ATT that all I needed to to was insert new sim, power on, and the phone would ask for the unlock code. When I did it, it was asking for a PIN#. I entered the unlock code but it kept saying invalid. I got down to "4 attempts left" and gave it to someone at the local carrier. They gave it back to me unworking and now it says "sim error - sim not installed or is invaid. Emergency calls only. The sim is good and I have verified the correct unlock code with ATT.

    Anyone know what to do? Is is a brick now or can it be fixed?

    05-18-2013 05:59 AM
  2. Howard Kao's Avatar
    I think the PIN for the SIM card may be different from the att unlock code. The PIN is specific to the SIM card you are using, and can be unlocked with the PUK (PIN unlock key) code if the SIM card has been locked by multiple failed attempts at the PIN, should be an 8 digit numeric code provided on the card that your SIM card came in. Not sure where to find the SIM's PIN, however, but try contacting your service provider. Good luck.
    05-18-2013 08:47 PM
  3. jefbeard911's Avatar
    Thanks - I think I've got the PIN/PUK number thing sorted out. The problem now is that my 900 is not recognizing the sim anymore. I even bought another one just to make sure it wasn't the sim. Same error message -" Sim Error. The sim is not installed or is invalid."

    I also have taken it to Nokia Care and they say there is nothing they can do. The phone has gone past its 10 attempts at unlocking. Went to another mobile store that unlocks phones and they say its done too....Just hoping to find a back door solution before I trash it.
    05-19-2013 03:28 AM
  4. YingTK's Avatar
    I am at the exactly same situation here. AT&T provided me wrong unlock code which a supervisor then confirmed with me, and my phone won't take any sim card from at&t anymore, and the store I went to told me the phone is dead in their opinion... This really sucks, at&t!
    05-22-2013 07:00 PM
  5. Florentino Jeronimo's Avatar
    Simcard pin
    06-15-2013 03:28 AM
  6. girishlingamaneni's Avatar
    Even I m facing the same problem. My lumia 900 is not showing network on inserting sim.

    Please provide solution for me.

    07-08-2013 06:10 AM
  7. girishlingamaneni's Avatar
    I am eagerly waiting for a solution from you guys. Please help. Nokia customer care center people are saying that they will do only authorized phones, As this phone is from US it can't be done by them. Expecting the response from you friends
    07-08-2013 06:14 AM
  8. jaqbk's Avatar
    I have the same problem "sim error - sim not installed or is invaid. Emergency calls only." anybody knows solution ? thanks in advance
    girishlingamaneni likes this.
    07-09-2013 04:36 PM
  9. girishlingamaneni's Avatar
    If any one find a solution or resolution to this problem please post here. Thanks much...
    07-10-2013 01:08 AM
  10. jefbeard911's Avatar
    Hey guys....Sorry but I am still stuck (see my original post at the top).

    Nokia Viet Nam has tried very hard to get the phone unlocked but they were unsuccessful. It turns out that the phone is permanently locked to my original carrier(ATT) do to one of their reps giving me the incorrect unlocking instruction. Lumia's only allow you 10 unlocking attempts before they are 'permanently' locked to the original carrier unwilling to help me. So I'm back on Android..

    .If you wanna know how I got Nokia to be so helpful I emailed Elop! (CEO of Nokia). He emailed me right back and put me in touch with Nokia Care Viet Nam who was very helpful (they had my phone for a month), or at least they tried very hard. But still no luck...

    I did find a YouTube video that shows you how to "short out" (i guess) the sim and it will unlock the phone. Haven't tried it yet and on't know if it just does a 'normal' unlock or if it will actually fix's the link for you that want to try....

    By the way. It starts out by saying "here's the way to remove the screen" but stick with it, you have to remove the screen to get to the sim area.. Good luck

    I will be back in touch if I find a solution.
    Last edited by jefbeard911; 08-01-2013 at 11:53 PM.
    08-01-2013 11:31 PM
  11. jefbeard911's Avatar
    ATT does really suck. I intentionally did 'live chats' with their agents to have a record of our conversation. They took no responsibility whatsoever for providing me the incorrect instructions. See my new post below - maybe it will help.

    PS- I ran up $1000 in roaming charges before it cut out. Good luck ATT getting it..hihihi
    08-01-2013 11:44 PM
  12. jefbeard911's Avatar
    You get it fixed...See my updated post below for an update...Good Luck!
    08-01-2013 11:45 PM
  13. jefbeard911's Avatar
    Any luck. See my updated post below. Maybe it will help.
    08-01-2013 11:46 PM
  14. jefbeard911's Avatar
    Thanks, but like I said about the phone is permanently locked by the carrier. Nothing can be done unless the carrier agrees to unlock it, which they wont. Besides, ive moved on. rockin an HTC 8S which is great.
    02-17-2014 10:06 PM

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